Zoo li txhua yam hauv peb lub ntiaj teb, cov tub yees yuav tsum ua raws li txoj cai tseem ceeb ntawm physics hu ua kev txuag hluav taws xob.Lub ntsiab lus yog tias koj tsis tuaj yeem tsim lub zog tawm ntawm qhov tsis muaj dab tsi lossis ua kom lub zog ploj mus rau hauv huab cua nyias: koj tsuas tuaj yeem hloov lub zog mus rau lwm hom.Qhov no muaj qee qhov cuam tshuam tseem ceeb rau cov neeg siv fridge.
Ua ntej, nws tsoo cov lus dab neeg hais tias koj tuaj yeem txias koj chav ua noj los ntawm kev tawm hauv lub qhov rooj tub yees qhib.Tsis muaj tseeb!Raws li peb nyuam qhuav pom, lub tub yees ua haujlwm los ntawm "nqus" cua sov los ntawm lub chiller txee nrog cov kua dej txias, ces tso cov kua dej tawm sab nraum lub txee, qhov chaw nws tso nws cov cua sov.Yog li yog tias koj tshem tawm qee qhov cua sov hauv koj lub tub yees, hauv kev tshawb xav, tib qhov nyiaj rov qab tshwm sim thaum tshav kub nyob ib ncig ntawm lub nraub qaum (hauv kev xyaum, koj tau txais cov cua sov me ntsis ntxiv vim tias lub cev muaj zog tsis zoo thiab nws tseem muab tawm. kub).Cia lub qhov rooj qhib thiab koj tsuas yog txav lub zog cua sov los ntawm ib feem ntawm koj chav ua noj mus rau lwm qhov.
Txoj cai ntawm kev txuag hluav taws xob kuj piav qhia vim li cas nws yuav siv sij hawm ntev kom txias lossis khov zaub mov hauv lub tub yees lossis lub tub yees.Cov zaub mov muaj dej ntau, uas yog tsim los ntawm lub teeb yuag molecules (hydrogen thiab oxygen yog ob ntawm lub teeb tshaj plaws atoms).Txawm tias ib qho me me ntawm cov kua dej (lossis zaub mov) muaj alojtus naj npawb ntawm cov molecules, txhua tus uas siv lub zog kom sov los yog txias.Tias yog vim li cas nws yuav siv li ob peb feeb kom boil txawm ib khob los yog ob lub dej: muaj ntau dua molecules kom sov tshaj yog tias koj tau sim boil ib yam dab tsi zoo li ib khob ntawm molten hlau los yog txhuas hlau.Tib yam siv rau kev ua kom txias: nws siv lub zog thiab lub sijhawm kom tshem tawm cov cua sov los ntawm cov kua dej xws li kua txiv hmab txiv ntoo lossis zaub mov.Tias yog vim li cas khov lossis txias zaub mov yuav siv sij hawm ntev.Nws tsis yog tias koj lub tub yees lossis lub tub yees tsis muaj txiaj ntsig: nws tsuas yog tias koj yuav tsum tau ntxiv lossis tshem tawm ntau lub zog los ua kom cov dej hloov pauv lawv qhov kub thiab txias ntau dua li ob peb degrees.
Cia peb sim muab qee cov duab ntxhib rau txhua qhov no.Tus nqi ntawm lub zog nws siv los hloov dej kub yog hu ua nws lub peev xwm tshwj xeeb, thiab nws yog 4200 joules ib kilogram ib degree celsius.Nws txhais tau tias koj yuav tsum siv 4200 joules ntawm lub zog kom sov los yog txias ib kilogram dej los ntawm ib tug degree (los yog 8400 joules rau ob kilograms).Yog li yog tias koj xav kom khov ib lub raj mis dej (qhov hnyav 1kg) los ntawm chav tsev kub ntawm 20 ° C mus rau lub freezer zoo li −20 ° C, koj yuav xav tau 4200 × 1kg × 40 ° C, lossis 168,000 joules.Yog tias koj lub tub yees lub thawv txias tuaj yeem tshem tawm cov cua sov ntawm lub zog ntawm 100 watts (100 joules ib ob), qhov ntawd yuav siv sijhawm 1680 vib nas this lossis li ib nrab teev.
Koj tuaj yeem pom tias ntau lub zog xav tau los ua kom cov khoom noj uas muaj dej txias.Thiab qhov ntawd, nyob rau hauv lem, piav qhia vim li cas lub tub yees siv hluav taws xob ntau heev.Raws li US Energy Information Administration, cov tub yees siv li ntawm 7 feem pua ntawm tag nrho cov hluav taws xob hauv tsev (kwv yees ib yam li TVs thiab cov khoom siv cuam tshuam, thiab tsawg dua li ib nrab ntawm cov cua txias, uas siv ib qho 17 feem pua).
Daim Ntawv Qhia: Kev siv hluav taws xob hauv tsev los ntawm kev siv kawg: Cov tub yees siv 7 feem pua ntawm cov hluav taws xob hauv tsev - tsawg dua li cov cua txias lossis cua sov.Cov tub yees hauv tsev tseem ceeb siv li 77 feem pua ntawm tag nrho cov tub yees hluav taws xob, cov tub yees thib ob siv 18 feem pua, thiab cov chav nyob ntxiv rau qhov seem.Qhov chaw:US Energy Information Administration,
Post lub sij hawm: Nov-02-2022