Agirê firna mîkropêl, kelûpelên metal, û teqînên şilê germkirî¶

Firinên mîkropêl li zêdetirî 90 ji sedî mitbaxên li seranserê Amerîkaya Bakur, Ewropa û Avusturalya hene, bi hilberandina pêlên elektromagnetîk ên bi frekansa bilind (bi gelemperî 2,45 gigahertz, an jî 2,45 mîlyar çerx di çirkeyê de) ji lûleya valahiya ku jê re magnetron tê gotin, bi hezaran caran bi pêbawer dixebitin. Ji ber ku mîkro pêlek xwarinê di hundurê xwe de germ dike û molekulên ava polar, rûn û şekir li şûna germkirina hewaya hawîrdorê di hundurê xwe de germ dike, mirov kêm kêm wekî xetereyek agir an teqînê difikirin. Lêbelê karûbarên agirkuj û navendên şewitandinê her sal bersivê didin bi hezaran acîlên mîkro.

Ev rewşa awarte bi sê awayên cihê diqewimin: agirê valahiya çalak (bi gelemperî dema ku kesek bi xeletî li şûna 2 hûrdeman li ser popcorn, nan, qutiyên hilgirtinê yên ji nû ve germkirî, an pakêtên germa birincê hişkkirî, 20 hûrdeman destnîşan dike, xwarinê vediguhere karbona ronî ku di nav agirê vekirî de gur dibe), pelik, girêkên metal, lewheyên bi zêr, an rûnê karbonîzekirî yên li ser kanala pêla mîka ya hundurîn ku birûskên voltaja bilind li seranserê valahiyê pêçayî), û teqînên buhara germî yên tund (gava ku poşmanên ava pir germkirî, hêkên tevayî, an konteynerên girtî li ber çavê bikarhêner rast diqelibin û li ber çavê bikarhêner vedibin. tê daxistin). Dizanin ka çima divê hûn deriyê mîkropêlê bi hişkî girtî bihêlin di dema agir de, meriv çawa kelûpela xwarinên bê zirar ji rêvebirê pêlê magnetronê yê şewitî cuda dike, û meriv çawa şilavên germkirî bi ewlehî rê li ber agirê xanî û şewatên rûyê kor dike.

Vê niha bikin¶

1. Deriyê mîkropêlê GIRTÎ bihêlin û bişkojka Betal/Rawestandin an tavilê yekîneyê jê derxînin. Ger xwarin, pakêta kaxiz, an dîwarê hundurê mîkropêlê çirûskê, çixareyê, an jî dişewite, nekin derî vekin da ku tiştê şewitî derxin derve. Ger hûn dikarin bi ewlehî xwe bigihînin dergeha dîwarê bêyî ku xwe bi dûman û agir vekin, kabloya elektrîkê ya mîkropêlê rasterast ji dîwêr derxînin (ji bo mîkropêla zêde ya ku di hundurê kabîneya jorîn de rasterast li jorê sobeyê tê girêdan, ** ne** kabîneyê li jor yekîneyeke şewitandî vekin; rasterast bimeşin ber bi panela xweya elektrîkê ya sereke û bixin ser panela 200 ya elektrîkê ya sereke û bixin ** OFF **).
2. Ger ku agir ji yekîneyê derkeve an dûman di nav 60 saniyeyan de nemire, telefonê nimreya xweya acîl bikin. Dema ku elektrîk qut bibe û derî girtî bimîne, divê agirê di hundurê valahiya metal a girtî de ji oksîjenê birçî bibe û di nav 1 û 2 hûrdeman de bimire. Ger êgir di nav hêlînên hewayê yên jorîn de belavî kabîneya darîn a jorîn bibe, ger panela kontrolê ya plastîk a derve bihele, an jî dûmana reş a giran ji yekîneyê dibare piştî ku elektrîk qut bibe, her kesî ji malê derxînin, heke gengaz be deriyê metbexê li pişt xwe bigirin û jimara xweya acîl ya herêmî (911 li Dewletên Yekbûyî û Kanada, 119, 119, 119, 119, li Yekîtiya Ewropî li seranserê Yekîtiya Ewropî bibînin. hejmarên acîl).
3. Agiravêja kîmyewî ya hişk (Class ABC) ber bi deriyê girtî ve bihêlin, û TUQET avê neavêjin ser amûrek pêvekirî. 2 metre (6 ling) li pişt xwe rawestin û agirberek pir-armanca xwe bigirin Agirava kîmyewî ya hişk a class ABC an karbondîoksîtê (\(CO_2\)) amade ye vemirîne. Tenê ger pencereya camê bişkê an jî agir bi kabîneya derve bişkîne piştî ku we qutkirina elektrîkê qut kir, divê hûn vemirandinê dakêşin nav agirê.
4. Herî kêm 30 heta 60 hûrdeman li bendê bimînin, berî ku deriyê mîkropêlê piştî agirek biqelişe vebe. Çenteyên popcornê yên karbonîzekirî, nanê şepirze û firaqên plastîk ên helandî germahiya navmalê ya tund li ser germahiya xweya agirgirtinê (ji 300 pileya Celsius / 570 pileya Fahrenheitê piştî şewata vekirî) digire. Vekirina derî 3 hûrdeman piştî derketina agir bi gelemperî bloka karbonê ya ku dişewite li ser têkiliya bi hewaya nû ya jûreyê re ji nû ve dişewite. Bisekinin heya ku cama pêşiyê li pişta destê we bi tevahî sar bibe, pêşî pencereyên metbexê vekin, û dema ku derî vekin li kêleka derî rawestin.
5. Heke we ava sade di kulmek xweş de keland û ew ne bilbil be, destê xwe nedin qedehekê û nedin hev. Ava ku di şûşeyek nermik an qedehek seramîk de di mîkropêlê de tê germ kirin, dikare li jor 100 dereceya Celsius (212 pileyî Fahrenheit) germ bibe bêyî ku yek buharek çêbike. Hebûna tavilê ji bo girtina destikê an avêtina kevçîk, kîsik, an granûlên qehweya tavilê di qedehê de dibe sedema kelijandina tavilê, teqemenî ku ava gewr rasterast di nav çav û rûyê we de diteqe. Deriyê mîkropêlê girtî bihêlin û bihêlin kasa 2 û 3 hûrdeman bêserûber rûne heya ku di binê xala kelînê de sar bibe berî ku dest bixin.
6. Her hilm, şilek, an teqîna hêkê tavilê 20 hûrdeman bi ava sar a hênik sar bikin. Ger ava pir germkirî, şorbe, an hêkek mîkropêla teqiyayî bi ser çerm an çavan de birije, tavilê çermê şewitî bixin binê ** ava sar a herikî (15 heta 20 pileyên Celsius / 59 heta 68 pileyan ji bo avê têr**) **20 hûrdem ** li pey me rêberê alîkariya yekem dişewitîne. Ger şilava germ an bermayiyên hêk li çavan bikevin, çavên vekirî bi nermî 15 heta 20 hûrdeman di bin ava sar a sar an xwêya sterîl de bişon û bi rêya meya meya me li lênihêrîna çavê ya lezgîn bigerin. rêberê birîndarên çavan.

Nexşeya herikîna tevgerê û ceribandina acîl a mîkropêlê¶

Vê dara biryarê bikar bînin da ku bi ewlehî bersivê bidin, li gorî ka mîkropêla we di agir de ye, çirûskek / qeşeng e, an xetereyek şilavê ya germkirî digire.

flowchart TD
    Start["Rewşa Awarte ya Mîkropêlê:<br/> Agir/Dûman, Çirûskên Elektrîkê (Arcing), an jî şilava zêde germkirî"] --> EventType{"Niha çi diqewime?"}

    EventType -->|"Şewat, îsotên şewqandî,<br/>an dûmana qalind di hundirê valavê de"| FireProtocol["1. DERIYÊ MÎKROWÊ BI TURÎ GIRTÎ BIKE<br/>2. Têlê jê derxin AN jî şkandina panela sereke bixin OFF<br/>3. Bi Class ABC Fire Extinguisher re bisekinin"]

    FireProtocol --> SpreadCheck{"Do flames breach the vents/cabinets<br/>or keep smoking after 2 minutes?"}
    SpreadCheck -->|"Erê, dûmana belav an giran"| Call911["Evacuate Home Immediately<br/>Close doors behind you and call 911 / 112 / 999"]
    SpreadCheck -->|"No, flames suffocate inside closed box"| CoolWait["Wait 30 to 60 minutes until front glass is cold<br/>Ventilate kitchen windows, then inspect unit<br/>(Do not reuse unit if wiring/cavity is charred)"]

    EventType -->|"Blue/white lightning sparks<br/>or buzzing zaps (Arcing)"| ArcStop["Press Stop/Cancel Immediately<br/>Wait 1 minute, then open door and inspect source"]
    ArcStop --> ArcSource{"Where did the sparks come from?"}

    ArcSource -->|"Pelik, girêvajok, kevçî, rimên metalîk,<br/> an gêzerên bi mîneralên bilind/hot dog"| RemoveMetal["Tiştê metalîk rakin an jî xwarinê bi avê tevlihev bikin<br/> Ger dîwarê valahiyê neşewitîbe, ewleh e ku meriv mîkropêl bikar bîne."]
    ArcSource -->|"Çirûskên ku ji qertonên biçûk<br/> li ser tavan/dîwarê kêlekê tên avêtin"| WaveguideFix["Unplug Microwave:<br/>Clean grease or replace $8 Mica Waveguide Cover<br/>(If metal tip of magnetron antenna underneath is melted, replace unit)"]

    EventType -->|"Boiled water in smooth mug<br/>or heated whole egg / sealed container"| SuperheatWait["DO NOT TOUCH OR OPEN IMMEDIATELY:<br/>Leave door closed for 3 to 5 minutes to cool below 100C (212F)<br/>If scalded, flush skin/eyes with cool tap water for 20 minutes"]

Scenario 1: Active microwave oven fire and toxic smoke containment¶

Over 85 percent of residential microwave fires start not from an electrical wiring fault, but from extreme thermal runaway in overcooked food or non-microwave-safe packaging. When a child or distracted adult enters 20:00 instead of 2:00 to heat a bag of microwave popcorn, a frozen pastry, a bread roll wrapped in a paper towel, or a homemade cloth heating pad filled with dry rice, flaxseed, or cherry pits:

1. During the first 2 to 3 minutes, the microwave boils off 100 percent of the free water moisture inside the food.
2. Once the water is gone, the temperature of the dry starch, cellulose paper, and oil climbs rapidly past 200 to 300 degrees Celsius (400 to 575 degrees Fahrenheit), converting the core of the food into pure black pyrolytic carbon (charcoal).
3. Carbon is an electrical conductor that absorbs 2.45-GHz microwave energy with extreme efficiency. The glowing red-hot carbon core rapidly reaches 500+ degrees Celsius (930+ degrees Fahrenheit), igniting the surrounding paper wrapper, cooking oil vapors, and polypropylene container into open flames.

Why opening the door causes a flashover explosion¶

Inside a closed microwave oven burning a bag of popcorn or a plastic bowl, the fire quickly depletes the oxygen inside the 30-to-50-liter (1-to-2-cubic-foot) box down below 10 percent. That leaves the cavity filled with unburned, superheated hydrocarbon smoke gases and glowing carbon waiting for oxygen.

If you yank the microwave door open to throw the burning bowl into the sink: - Fresh 21-percent room oxygen rushes into the cavity, instantly igniting the accumulated smoke gas in a mini smoke explosion (backdraft) right in front of your face and hands. - Worse yet, lifting a pool of burning grease or melting flaming plastic triggers dripping fire across your kitchen counter and floor. - Always leave the door latched shut. The tempered glass window and steel mesh screen (the Faraday cage that keeps microwaves inside) are engineered to contain small internal food fires safely until the oxygen runs out.

How to safely air out acrid microwave smoke and clean or replace the unit¶

Once the breaker has been off for 45 to 60 minutes and the glass door is completely cold:

1. Ventilate before opening: Open all kitchen windows and exterior doors and place a box fan in a window blowing outward to create negative pressure that pulls the acrid smell straight outdoors (do not turn on a recirculating over-the-range exhaust hood fan if it simply blows smoke back out the top louvers into your kitchen ceiling).
2. Protect your hands and lungs: Put on heavy kitchen oven mitts or nitrile gloves and avoid breathing directly over the door as you open it, because burnt plastic (polystyrene/polypropylene) and scorched Teflon/non-stick popcorn bag linings release irritating aldehydes, styrene, and acidic fumes.
3. Remove the charred remains into a metal pot or wet steel sink: Transfer the cold charred debris directly into a metal pot with a lid or douse it thoroughly in a stainless-steel sink before taking it outside to the outdoor trash bin.
4. Decide whether the microwave is safe to ever plug in again:
5. Discard and replace the microwave immediately if: Any interior plastic ceiling panel or turntable coupler has melted, the interior painted steel walls are blistered down to bare metal, the door seal gasket or door latches are warped (which can leak microwave radiation), electrical smoke came from the side control panel vents, or the glass window is cracked.
6. If it was strictly a minor scorched food / heavy smoke event with zero structural scorching: Unplug the unit, wash the interior walls and glass turntable thoroughly with warm water, liquid dish soap, and baking soda paste to neutralize acidic smoke residue, and leave a bowl of white vinegar or activated charcoal pebbles inside the unpowered closed unit for 48 hours to absorb lingering smoke odors.

Scenario 2: Sparks and lightning inside the microwave (Electrical arcing)¶

Seeing bright blue-white electrical sparks, plasma flashes, or hearing a loud bzzzz-ZAP noise inside a running microwave is terrifying, but it does not mean the microwave is about to explode like a bomb. This phenomenon is called dielectric breakdown and electrical arcing.

Why metal and certain foods spark in a microwave¶

Microwaves are electromagnetic waves that cause free electrons in conductive materials to surge back and forth 2.45 billion times per second.

• Thin, sharp, or crinkled metal edges vs. thick smooth metal: Smooth, thick steel walls (like the inside walls of the microwave itself) reflect microwaves harmlessly like a mirror. However, when microwaves hit thin aluminum foil, a crinkled foil wrapper, a metal twist-tie, the pointed tines of a fork, or the microscopic hairline gold/silver metallic paint trim on fine china mugs, electrons crowd violently onto the sharp points and thin edges. This creates a massive voltage gradient (thousands of volts per centimeter) that ionizes the air into a glowing plasma lightning arc jumping between two metal points or from the foil to the microwave wall.
• ** Çima gêzer, tirî, kûçikên germ, û goştê hestî carinan çirûskê dikin (Metal tune)**: Ji bo dîtina çirûskan hewcedariya we bi metal jî di mîkropêlê de tune:
• Cut baby carrots, green beans, and kale: Vegetables grown in mineral-rich soil contain natural salts, iron, magnesium, and potassium, and when cut with a sharp knife into pointed raw edges with very little surrounding water, they act like miniature dipole antennas that carbonize at the tips and spark.
• Hot dogs and sausages: High concentrations of curing salts and uneven fat/mineral pockets can cause small localized surface arcs.
• Cut grapes: Two halves of a grape connected by a thin bridge of skin have the exact diameter to resonate with the 12.2-centimeter wavelength of 2.45-GHz microwaves inside water, Focusing an electromagnetic hot spot right at the touch point that ionizes potassium and sodium ions into a bright flare of plasma.

Diagnosis table: harmless food spark vs. dangerous waveguide fire¶

Whenever you see sparks inside a microwave, press Stop/Cancel immediately and use this table to inspect the interior once stopped:

Meriv çawa Kulîlkek Mica Waveguide ya şewitî bi binê 10 $ vekolîne û biguhezîne¶

Gelek kes firna mîkropêla 300 dolarî ya bêkêmasî davêjin ji ber ku çirûsk ji dîwarê destê rastê yê hundur (an banê jorîn) jî gava ku mîkro bi tevahî vala ye dest pê dikin.

Li hundurê valahiya mîkropêla xwe binêre: li ser dîwarê rast, dîwarê piştê, an tavan, hûn ê lewheyek piçûk a çargoşeyî an ovalek (nêzîkî 5 bi 10 santîmetre / 2 bi 4 înç) bibînin ku dişibin kartonê gewr hişk an zirav, ku ji hêla tabloyên plastîk ên piçûk an yek çîçek ve tê girtin. Ango pêlava pêla mîka ** ye. Li pişt wê qapaxê tunela metalê ya vala (**rêbera pêlê **) ku boriya magnetronê enerjiya mîkropêlê di nav qutiya pijandinê de diherike. Pelê mîka rê dide pêlên mîkro rasterast di nav de derbas bibin dema ku buharê diparêze û sosê spaghetti ji tunela magnetronê dirijîne.

When old splattered grease or food on that mica sheet gets baked repeatedly, the grease turns into black conductive carbon. The next time you turn the microwave on, high-frequency energy arcs across that black carbon spot like a welding torch, burning a black hole right through the mica sheet:

1. Kurda elektrîkê ya mîkropêlê ji dîwêr vekin.

1. Pop out or unscrew the burned rectangular mica waveguide cover from inside the cooking cavity.
2. Shine a flashlight into the rectangular opening to inspect the magnetron antenna tip: Look inside the short metal tunnel behind the cover. You will see a small cylindrical metal cap (looks like a little brass or copper thimble about 1.5 centimeters wide) sticking down: that is the magnetron antenna cap.
3. If the metal tunnel is clean and the magnetron antenna cap is intact (or just has a tiny wipeable soot smudge), wipe the tunnel clean with a damp cloth and rubbing alcohol, trace your old mica cover onto a universal cut-to-fit replacement microwave mica sheet (available at hardware or appliance parts stores for 5 to 10 dollars), cut it out with household scissors, and snap the new mica cover into place. Your microwave will work like new without a single spark.
4. If the metal magnetron antenna cap itself has a melted hole burned through its tip or the metal cavity edges around the hole are badly burned away, either the magnetron tube must be replaced by a technician or the microwave should be replaced.

Scenario 3: Superheated water and exploding food burns¶

A microwave oven can create two severe physical explosion hazards that cause thousands of emergency department admissions for facial, corneal, and chest scalds every year: superheated liquids and pressurized membrane explosions.

1. The physics of superheated water (Why calm water explodes in your face)¶

When you boil a pot of water on a gas or electric stove burner, heat enters from the bottom metal pan. Microscopic scratches and rough pits on the bottom of the pot trap tiny pockets of air (nucleation sites) where steam bubbles form easily and rise to the surface in a rolling boil as soon as the water hits 100 degrees Celsius (212 degrees Fahrenheit).

When you heat plain, clean water inside a smooth glass, ceramic mug, or Pyrex measuring cup in a microwave, two dangerous things happen simultaneously: - The microwave heats the water molecules uniformly throughout the core of the liquid rather than from the bottom up, and the smooth glazed glass or ceramic interior has zero rough scratches or air pockets (no nucleation sites) where a steam bubble can start forming. - As a result, the liquid water stays completely still and calm without a single bubble while its actual temperature climbs past 100 degrees Celsius (212 degrees Fahrenheit) to 102 to 106 degrees Celsius (215 to 223 degrees Fahrenheit): a metastable state called superheating.

The instant you break that delicate tension (either by jarring the cup as you lift it toward your face, or by dropping a spoon, a teabag, a pinch of sugar, or instant coffee crystals into the mug), you suddenly introduce thousands of microscopic air bubbles (nucleation sites) into superheated water. Within a millisecond, the excess thermal energy converts into a massive steam bubble at the bottom of the mug, blasting the entire cup of boiling water upward like a cannon straight into your face, eyes, and chest.

How to prevent and survive superheated liquid hazards¶

• If you already overheated a mug of plain water in the microwave:
• Do not open the door and grab the mug. Leave the microwave door closed for 2 to 3 full minutes so conductive cooling brings the water safely below 100 degrees Celsius (212 degrees Fahrenheit).
• Before lifting the mug out, stand back at arm's length with your face turned away and tap the side of the mug gently with a long wooden spoon to verify nothing erupts.
• How to prevent superheating every time you microwave water:
• Do not overheat water: Heat a single mug of water for no more than 60 to 90 seconds on High, stopping before it reaches boiling temperature.
• Place a clean wooden popsicle stick, wooden chopstick, or non-metallic wooden stir stick inside the cup of water BEFORE turning the microwave on: The porous wood grain provides millions of natural microscopic air pockets (nucleation sites), forcing the water to bubble gently and safely as soon as it reaches boiling point instead of superheating. (Note: Do NOT leave a metal spoon in the cup if your microwave manual prohibits it or if the spoon could touch the cavity walls.)
• Stir soluble powder (instant coffee, sugar, or bouillon) into the cold water BEFORE microwaving if appropriate, as dissolved particles help prevent pure-water superheating.

2. Why whole eggs, chestnuts, and sealed containers explode AFTER you take them out¶

Never microwave a whole egg in its shell, a peeled hard-boiled egg, or an unpierced egg yolk, even just to reheat a cold hard-boiled egg for 15 seconds.

• Inside an egg yolk (even one that is already hard-boiled), tiny pockets of water are trapped inside a dense, rubbery protein matrix surrounded by an impermeable membrane.
• Microwaves pass straight through the egg white and heat the water inside the center of the yolk far above 100 degrees Celsius (212 degrees Fahrenheit), building high-pressure superheated steam locked inside the rubbery yolk and shell.
• Crucially, a microwaved egg often does not explode while inside the microwave. Instead, it waits until you take it out, set it on your plate, and pierce it with your fork or bite into it with your teeth, at which point the pressurized yolk detonates with the force of a firecracker, causing severe corneal burns to the eyes, facial blisters, and oral burns.
• Foods you must ALWAYS pierce, slit, or vent before microwaving:
• Eggs: Crack raw eggs into a bowl and pierce the yolk membrane several times with a fork or toothpick (or scramble them); cut reheated hard-boiled eggs into small quarters before warming gently at 50% power.
• Whole potatoes, sweet potatoes, winter squash, eggplant, tomatoes, grapes, chestnuts, and apples: Stab the skin deeply 6 to 8 times all around with a fork so internal steam can hiss out harmlessly.
• Sausages, hot dogs, and chicken livers: Score or prick the outer casing.
• ** Konteynirên plastîk ên girtî, firaxên xwarina zarokan, û kîsikên silîkonî **: Qepaxek plastîk a hişk girtî an firaxek camîn a sergirtî nepêlînin; her gav quncikek qapaxê herî kêm 2 santîmetre (1 înç) veke da ku buharê derxe.

Pirsên pir caran têne pirsîn¶

Çavkaniyan kontrol kirin¶

• United States Fire Administration (USFA / FEMA) and National Fire Protection Association (NFPA, United States): Home Cooking and Microwave Oven Fire Safety Sheets (keep-door-closed protocol, unplugging, and fire statistics).
• United States Food and Drug Administration (FDA, Center for Devices and Radiological Health): Microwave Oven Radiation Safety, Arcing Prevention, and Superheated Water / Exploding Egg Consumer Alerts.
• Consumer Product Safety Commission (CPSC, United States): Household Appliance Fire Hazards, High-Voltage Capacitor Electrocution Alerts, and Scald Burn Prevention.
• Health Canada (Canada): Radiation Safety of Microwave Ovens (door interlock safety, superheating physics, and safe container selection).
• London Fire Brigade and National Fire Chiefs Council (NFCC, United Kingdom): Microwave Fire Safety and White Goods Electrical Isolation Guidance.
• American Burn Association (ABA, United States) and British Burn Association (BBA, United Kingdom): First Aid Clinical Guidelines for Scald Burns and Ocular Thermal Injuries from Superheated Liquids and Microwaved Eggs.

rêberên Related¶

• Agirê metbexê
• Appliance agir dike
• Dişewite
• Birînên çavan