Qhov sib txawv tseem ceeb ntawm qhov ceev thiab qhov hnyav yog qhov hnyav yog qhov ntsuas ntawm cov teeb meem hauv ib yam khoom, qhov ntom ntom ntsuas qhov ntsuas ntawm cov teeb meem hauv ib chav tsev.
Qhov hnyav thiab qhov hnyav yog lub cev muaj zog ntawm cov teeb meem. Ob qho khoom muaj feem xyuam nrog huab hwm coj. Ntxiv mus, cov khoom no muaj txiaj ntsig zoo hauv physics thiab engineering thaum piav txog cov khoom.
Dab tsi yog qhov ntom ntom?
Density yog ib yam khoom ntawm lub cev, uas yog qhov ntsuas ntawm cov teeb meem muaj nyob rau hauv ib chav tsev ntim. Nws tsis hloov nrog qhov loj ntawm tus qauv; li no peb hu nws ib yam khoom muaj zog. Qhov ntom yog qhov sib piv ntawm huab hwm coj mus rau ntim thiab yog li muaj lub cev qhov ntev ntawm ML-3. Kev ntsuas qhov ceev yog feem ntau kilograms ib cubic meter (kgm-3) los yog grams ib milliliter (g/ml).
Thaum ib yam khoom tau muab tso rau hauv cov kua, nws yuav ntab yog tias cov khoom muaj qhov ntom ntom dua li cov kua. Qhov no yog vim li cas cov dej khov ntab saum dej. Yog tias ob lub kua dej (uas tsis sib xyaw ua ke) nrog qhov sib txawv ntawm qhov sib txawv tau muab tso ua ke, cov kua uas muaj qhov ntom ntom tsawg dua ntab rau ntawm cov kua nrog qhov ntom ntom dua.
Daim duab 01: Ice Floating on Water
Nyob hauv qee daim ntawv thov tshwj xeeb, peb tuaj yeem txhais qhov ceev raws li qhov hnyav / ntim. Peb hu nws qhov hnyav, thiab qhov no, chav tsev yog Newton ib cubic meter.
Nyhav yog dab tsi?
Nyhav yog lub zog siv rau ntawm ib yam khoom vim qhov gravitational teb. Nws yog ncaj qha ntsig txog qhov loj, thiab peb tuaj yeem muab nws raws li cov khoom ntawm qhov loj thiab gravitational teb. Qhov hnyav muaj tib qhov ntev raws li lub zog (MLT-2), thiab cov ntsuas ntsuas yog Newton lossis kilogram qhov hnyav (kgwt).
Vim qhov hnyav yog cuam tshuam nrog lub gravitational teb, peb tuaj yeem ntsuas qhov hnyav sib txawv hauv qhov chaw sib txawv. Piv txwv li, qhov hnyav ntawm ib yam khoom ntawm lub hli yog ib feem rau ntawm nws qhov hnyav hauv ntiaj teb. Tsis tas li ntawd, qhov hnyav kuj tuaj yeem sib txawv ntawm ntau qhov chaw hauv ntiaj teb vim qhov hloov pauv hauv lub ntiajteb txawj nqus. Txawm li cas los xij, qee zaum peb xav txog qhov hnyav raws li cov cuab yeej tas li.
Yog qhov chaw zoo ib yam, qhov hnyav yog proportional rau huab hwm coj, uas yog qhov ntsuas ntawm cov khoom muaj nyob hauv cov khoom. Qhov hnyav yog ib qho khoom siv dav hauv lub cev vim nws nce thaum qhov khoom loj dua.
Qhov txawv ntawm qhov ntom thiab qhov hnyav yog dab tsi?
Density yog ib yam khoom ntawm lub cev, uas yog ib qho kev ntsuas ntawm cov teeb meem muaj nyob rau hauv ib chav tsev ntim thaum hnyav yog lub zog siv rau ntawm ib yam khoom vim lub gravitational teb. Qhov sib txawv tseem ceeb ntawm qhov ceev thiab qhov hnyav yog qhov hnyav yog qhov ntsuas ntawm cov teeb meem hauv ib yam khoom, qhov ntom ntom ntsuas cov teeb meem hauv ib chav tsev. Tsis tas li ntawd, qhov ceev yog ib qho khoom siv lub cev hnyav thaum qhov hnyav yog qhov khoom siv dav.
Thaum xav txog cov ntsuas ntsuas, qhov hnyav yog ntsuas hauv Newton, qhov ceev yog ntsuas hauv kilograms ib cubic meter. Tsis tas li ntawd, qhov hnyav yog cuam tshuam ncaj qha rau lub ntiajteb txawj nqus thaum qhov ceev tsis muaj kev sib raug zoo nrog lub gravitational teb.
Summary – Ceev vs Nyhav
Density yog ib yam khoom ntawm lub cev, uas yog ib qho kev ntsuas ntawm cov teeb meem muaj nyob rau hauv ib chav tsev ntim thaum hnyav yog lub zog siv rau ntawm ib yam khoom vim lub gravitational teb. Qhov sib txawv tseem ceeb ntawm qhov ceev thiab qhov hnyav yog qhov hnyav yog qhov ntsuas ntawm cov teeb meem hauv ib yam khoom, qhov ntom ntom ntsuas cov teeb meem hauv ib chav tsev.
