Cia koj cov menyuam zoo siab txog STEM nrog cov kev sim ua paj kws nrov!
Popcorn, txwv tsis pub hu ua Zea mays everta, yog ib hom pob kws, thiab tawm ntawm plaub hom pob kws ntau tshaj plaws - qab zib, dent, flint, thiab paj kws - nws yog tib hom uas pops. Qhov no yog txhua yam ua tsaug rau nws lub cev nyias nyias, uas tso cai rau nws qhib.
Dab tsi koj yuav tsis paub nws tias cov khoom noj txom ncauj qab no kuj yog cov khoom siv zoo heev rau kev sim ua paj kws. Tsis muaj teeb meem yog tias koj xav kom muaj kev lom zem hauv tsev lossis yog tias koj tab tom sim nrhiav qee cov paj kws tshawb fawb txog kev ncaj ncees, peb muaj qee qhov kev xaiv pob kws!
Tub sim piv ntsuas kub
Cov neeg feem coob khaws cov paj kws nyob rau hauv chav tsev kub hauv lawv lub pantries lossis chav ua noj, tab sis yuav ua li cas yog tias koj lub khw paj kws hauv lub tub yees lossis lub tub yees? Qhov kub puas cuam tshuam rau paj kws lub peev xwm popping?
Qhov kev sim no sim seb qhov ntsuas kub puas cuam tshuam rau qib noo noo ntawm paj kws. Teeb tsa rau qhov kev sim yuav siv sij hawm txog ib teev. Tom qab ntawd, cov hnab yuav tsum zaum tsawg kawg 24 teev. Kev ua tiav qhov kev sim yuav siv sijhawm li ib mus rau ob teev.
Fast Fact
Qhov no tuaj yeem ua rau qhov project paj kws zoo nkauj rau cov menyuam yaus hnub nyoog qis dua qib peb txog tsib!
Materials
- 16 lub hnab ntawm tib hom thiab hom paj kws microwaveable
- Microwave
- Microwave popcorn popper
- Ob quart ntsuas khob uas yog microwave nyab xeeb
- Baking sheet
- Tus kav
- Piv thiab ntawv
- Sandwich baggies
Cov lus qhia
- Tshuaj tawm ib qho qauv me me ntawm 50 kernels ntawm txhua lub hnab paj kws. Muab cov kernels tso rau hauv ib lub sandwich baggie. Ua 15 baggies.
- Tau npe txhua lub hnab nrog tus lej kom koj thiaj paub tias yog qhov twg tom qab.
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Tsim ib daim ntawv nrog kab rau txhua lub hnab ntim khoom xws li:
Volume Number of Unpopped Kernels Popped Kernel Size Bag 1 Bag 2 Bag 3 - Muab tsib lub hnab rau hauv lub tub yees, tsib lub hauv lub tub yees, thiab tsib ntawm chav tsev kub ntawm chav ua noj txee. Tso lub hnab rau 24 teev.
- Preheat lub microwave los ntawm cua sov ib khob dej rau ib feeb. Tshem lub khob kom zoo. Qhov no tsuas yog yuav tsum tau ua ua ntej thawj lub hnab.
- Tshem tawm cov qauv me me ntawm cov pob kws los ntawm lub hnab paj kws ntxiv thiab muab tso rau hauv lub microwave popcorn popper. Teem lub timer rau tsib feeb. Thaum koj pib hnov cov popping tus nqi qeeb mus txog li ob mus rau peb vib nas this ntawm pops, nres lub microwave thiab nco lub sijhawm. Teem lub sijhawm rau lub sijhawm no rau tag nrho ntawm qhov kev sim.
- Nqa ib lub hnab los ntawm lub freezer, tso tag nrho cov kernels rau hauv lub popper, thiab pop rau lub sij hawm teem los ntawm kauj ruam rau.
- Tshem tawm lub popper thiab tos kom txog thaum tag nrho cov pops tau nres.
- Muab lub tais tso rau hauv lub khob ntsuas ob-quart thiab sau cov nyiaj hauv kab "Volume" ntawm cov ntaub ntawv.
- Ncuav cov ntsiab lus ntawm lub khob ntsuas mus rau ib daim ntawv ci thiab suav cov naj npawb ntawm tag nrho cov kernels unpopped. Sau tus lej hauv cov ntaub ntawv.
- Siv tus kav centimeter, ntsuas qhov ntev ntawm qhov nruab nrab loj popped kernel. Sau qhov ntev ntawm cov ntaub ntawv.
- Rov ua cov kauj ruam 6 txog 10 nrog cov hnab seem uas tau muab khaws cia rau hauv lub tub yees, tub yees, thiab hauv chav tsev kub. Nco ntsoov sim ib lub hnab ntawm ib lub sijhawm kom ntseeg tau tias cov kernels nyob ntawm lawv qhov ntsuas kub kom ntev li ntev tau ua ntej kuaj.
- Sib piv cov ntaub ntawv hauv lub rooj thiab ua cov lus xaus.
Fast Fact
Popcorn kernels muaj me me dej hauv lawv. Raws li cov paj kws tau ua kom sov, cov dej nthuav dav, tig mus rau hauv chav ntawm 212 degrees Fahrenheit thiab tawg ib ncig ntawm 347 degrees Fahrenheit. Txawm li cas los xij, paj kws xav tau ntawm 13.5 thiab 14 feem pua ntawm cov dej noo kom pop. Lub tub yees thiab lub tub yees ob qho tib si txo cov dej noo ntawm cov paj kws paj kws yog li koj cov menyuam yuav pom cov pob kws tsis tshua muaj nyob hauv cov khoom siv no.
Popcorn Matters
Dab tsi yog qhov hloov pauv lub cev piv rau cov tshuaj hloov pauv - thiab lawv tshwm sim li cas? Popcorn thiab marshmallows yog cov cuab yeej zoo rau kev qhia zaj lus qhia txog chemistry! Rau cov neeg tsis paub, teeb meem yog nyob txhua qhov chaw, thiab nws suav nrog txhua yam uas siv qhov chaw thiab muaj huab hwm coj. Qhov no suav nrog ob qho ntawm cov khoom qab zib thiab savory.
Qhov kev sim no qhia cov menyuam yaus txog tshuaj lom neeg thiab lub cev thiab nws yuav siv sijhawm tsawg dua ib teev kom tiav. Qhov kev sim no zoo tagnrho rau cov menyuam yaus hnub nyoog qis dua, tab sisSUPERVISION YUAV TSUM.
Physical Versus Chemical Changes
Qhov tom ntej uas koj yuav tsum paub ua ntej koj pib yog muaj tsib theem ntawm cov teeb meem: cov khib nyiab, kua, roj, plasmas, thiab Bose-Einstein condensates. Thaum ib qho kev hloov ntawm lub cev tshwm sim, tsuas yog qhov tshwm sim ntawm qhov teeb meem yuav raug hloov. Thaum muaj tshuaj hloov pauv, koj yuav pom qhov hloov pauv ntawm qhov tsw lossis tsw ntxhiab ntawm cov khoom noj.
Los ntawm kev ntxiv cua sov rau cov paj kws paj kws, cov kua hauv lawv tig mus rau chav thiab lawv pop, hloov lawv lub cev. Nyob rau hauv rooj plaub ntawm paj kws, qhov no yog ib qho kev hloov ntawm lub cev mus tas li, txhais tau tias koj tsis tuaj yeem thim rov qab cov tshuaj tiv thaiv.
Hloov pauv, thaum koj tuav lub marshmallow hla nplaim taws, nws tuaj yeem yaj (lwm lub cev hloov pauv) lossis nws tuaj yeem hlawv (kev hloov tshuaj lom neeg). Thaum tshav kub sib xyaw nrog cov suab thaj hauv marshmallow, cov dej molecules raug tsim, uas ces evaporate thiab tsim carbon. Cov pa roj carbon yog cov seem dub uas koj yuav pom ntawm marshmallow nto. Thaum cov tshuaj hloov pauv lossis tsim hauv cov tshuaj tiv thaiv, nws yog tshuaj hloov pauv!
Materials
- Microwaveable popcorn hnab los yog ntim ntawm cov paj kws tsis tau popped
- Ob lub Mason jars lossis siab ntshiab iav haus
- Microwave
- Microwave popcorn popper (Tsuas yog xav tau rau cov paj kws tsis tau popped)
- Marshmallows
- Barbeque skewers
- paper phaj
- Ib nplaim (lub qhov cub roj lossis lub teeb ob leeg ua haujlwm)
Instructions Part 1: Popcorn Changes
- Cia me nyuam suav ob pab pawg ntawm 100 kernels ntawm cov paj kws uas tsis tau pom dua. (Ceeb Toom: Cov menyuam yaus yuav xav suav txog 120 kernels rau pawg popped paj kws los xyuas kom meej 100 popped kernels muaj rau kev sim)
- Muab ib pawg ntawm cov paj kws tsis tau ntim rau hauv Mason hub los yog iav haus siab.
- Pop pab pawg thib ob ntawm cov paj kws tsis muaj paj kws siv lub microwave paj kws paj kws. Xwb, pop ib lub hnab microwave ntawm paj kws.
- Muab 100 kernels ntawm popped paj kws nyob rau hauv Mason hub los yog siab haus iav.
- Piv ob lub khob paj kws paj kws. Ob leeg tseem yog paj kws. Ib qho qauv tsuas yog sab hauv!
Instructions Part II: Marshmallow Changes
- Cov niam txiv yuav tsum tso ob lub marshmallows rau ntawm lub barbeque skewer.
- Tom ntej no, tawm ntawm koj tus me nyuam mus txog, tab sis ze txaus rau lawv pom, tuav lub marshmallow kawg ntawm skewer hla nplaim taws, cia cov marshmallow hlawv.
- Muab cov marshmallow rau ntawm daim ntawv phaj thiab cia kom txias.
- Tom qab ntawd, cia koj cov menyuam kuaj xyuas qhov txias, hlawv marshmallow thiab muab piv rau cov marshmallow tshiab los ntawm lub hnab.
Nco ntsoov taw tes rau ob qho tib si xim, kev ntxhib los mos thiab tsw hloov ntawm marshmallow
Nco ntsoov
Qhov zoo tshaj plaws ntawm qhov kev sim no yog tias koj tuaj yeem siv lwm cov marshmallows los ua cov khoom qab zib rau koj cov paj kws thiab muaj qhov zoo tshaj plaws thaum tav su kho!
Dancing Popcorn Experiment
Nov yog lwm qhov kev sim ua paj kws zoo siab uas qhia tawm cov tshuaj tiv thaiv! Thaum koj sib tov baking soda thiab vinegar, nws tsim carbon dioxide, uas yog ib tug roj. Thaum koj sib tov ob lub tebchaw no hauv dej thiab poob rau hauv cov pob kws paj kws, paj kws paj kws yuav ntab mus rau saum npoo raws li cov roj nce mus rau saum lub khob. Raws li cov pa tawm mus rau saum huab cua, cov kernels yuav poob rov qab mus rau hauv qab thiab cov txheej txheem yuav txuas ntxiv mus txog thaum tag nrho cov pa yuav ploj mus.
Materials
- Plain paj kws kernels (1/4 khob)
- Ib lub thawv loj, ntshiab Mason los yog khob haus dej (24 ooj)
- Spoon
- Baking Soda (2 tbsp)
- White Vinegar (6 tbsp)
- Dej (3 khob)
Quick Tip
Kev xyaum seev cev paj kws tuaj yeem txhim kho los ntawm kev ntxiv ob peb tee ntawm cov zaub mov xim los ua kom pom cov foob pob hluav taws zoo li cov kernels nce thiab poob hauv dej!
Cov lus qhia
- Sau koj lub hub lossis iav nrog dej, tawm me me ntawm qhov chaw saum lub thawv.
- Ntxiv 5-10 tee zaub mov xim. (yeem)
- Sib tov hauv koj cov baking soda thiab do kom txog thaum nws yaj.
- Pho rau hauv koj cov paj kws paj kws.
- Ntxiv rau koj cov kua txiv hmab txiv ntoo thiab npaj saib koj cov kernels seev cev!
Grow Popcorn
Popcorn tsis loj hlob hauv lub hnab microwave. Nws yog ib daim ntawv tshwj xeeb ntawm pob kws uas nyuam qhuav tshwm sim rau pop thaum kub kub. Nws loj hlob hauv av ib yam li cov nroj tsuag niaj hnub, ua rau nws yog qhov zoo tshaj plaws rau cov menyuam yaus! Loj hlob paj kws cog qoob loo yog ib qho kev sim yooj yim los qhia cov me nyuam hauv qib ob txog plaub lub tswv yim ntawm cov noob germination. Nws kuj tso cai rau cov menyuam yaus pom cov nroj tsuag ua hauv av.
Qhov kev sim no siv sijhawm li 30 feeb los teeb tsa, tab sis nws yog ib txoj haujlwm ntev uas yuav zaum rau ib lub sijhawm thaum cov nroj tsuag loj hlob. Cov nroj tsuag yuav tsum tau ywg dej ib ntus, thiab rov ua dua tom qab ib lub lim tiam los yog li ntawd. Tom qab ob peb hnub, cov me nyuam yuav tsum pom lub hauv paus pib tawm ntawm cov noob, ua raws li los ntawm ib tug sprout nyob rau hauv lwm ob peb hnub. Nrog lub hnub ci txaus thiab dej, cov noob yuav tsum loj hlob mus rau hauv cov paj kws cog qoob loo tag nrho.
Materials
- Cov noob paj kws (Ceebtoom: Feem ntau cov paj kws paj kws muag hauv lub khw yuav tsis loj hlob yog li cov noob yuav tsum tau yuav los ntawm cov noob qoob loo)
- Clear yas khob
- paper phuam
- Ntawv cim npe
- ntsuas khob
- dej
Cov lus qhia
- Qhia daim ntawv phuam, kom nws dav npaum li lub khob siab.
- Muab daim ntawv phuam, kom nws snugly kab hauv lub khob.
- Muab ob mus rau peb lub noob paj kws rau hauv lub khob ntawm daim ntawv phuam thiab lub khob phab ntsa.
- Kos hnub cog rau ntawm lub khob thiab lub npe ntawm tus menyuam (yeem) nrog tus cim.
- Ntxiv dej rau hauv qab khob. Daim ntawv phuam yuav tsum nqus dej.
- Muab lub khob rau ntawm windowsill qhov twg cov nroj tsuag tuaj yeem tau txais tshav ntuj.
- Saib seb yuav ua li cas rau cov nroj tsuag nyob rau ob peb lub lis piam tom ntej no.
Experiment Notes
- Cov noob paj kws yuav tsum tau muab tso rau hauv dej rau 24 teev ua ntej cog. Nyeem cov chaw tsim cov noob cov ntawv rau cov lus pom zoo.
- Daim ntawv phuam yuav tsum ntub txhua lub sijhawm, tab sis nws yuav tsum tsis txhob ntub dej.
- Yog tias tsob ntoo loj dhau rau lub khob, nws tuaj yeem rov cog rau hauv lub lauj kaub nrog av.
Popping Science Fun
Popcorn tuaj yeem siv ntau yam kev sim rau menyuam yaus. Nws yog cov khoom siv yooj yim thiab pheej yig uas tuaj yeem siv ntau txoj hauv kev los qhia txog cov tswv yim kev tshawb fawb xws li kev hloov pauv ntawm lub cev thiab tshuaj, cov noob germination, thiab kev sim tsim kev tshawb fawb. Cov no tsuas yog ob peb qhov kev sim uas tuaj yeem ua rau cov menyuam yaus. Ua kom muaj tswv yim thiab ua koj tus kheej thiab tom qab ntawd ua rau koj tus kheej noj qab haus huv nrog cov khoom seem!
