Qhov sib txawv tseem ceeb ntawm qhov siab ntawm cov khoom thiab cov kua dej yog qhov siab ntawm cov khoom siv tsuas yog vim qhov hnyav ntawm cov khoom, qhov siab ntawm cov kua tshwm sim vim qhov hnyav thiab txav ntawm cov kua molecules.
Siab yog ib lub tswv yim tseem ceeb hauv physics. Lub tswv yim ntawm lub siab ua lub luag haujlwm tseem ceeb hauv kev siv xws li thermodynamics, aerodynamics, dej mechanics, thiab deformations. Yog li, nws yog ib qho tseem ceeb kom muaj kev nkag siab zoo ntawm kev siab kom ua tau zoo hauv txhua qhov chaw uas siv lub siab ua lub hauv paus ntsiab lus.
Lub Siab Ntawm Cov Khoom yog dab tsi?
Lub siab ntawm cov khoom tshwm sim vim qhov hnyav ntawm cov khoom. Peb tuaj yeem txhais lub siab no siv qhov kev sib cav raws li cov kua siab. Cov atoms hauv ib qho khoom yog static. Yog li ntawd, tsis muaj kev tsim ntawm lub siab los ntawm lub zog hloov ntawm ib qho khoom. Tab sis qhov hnyav ntawm cov khoom kem saum toj ib lub ntsiab lus yog qhov zoo ntawm qhov hais. Qhov no ua rau lub siab nyob hauv cov khoom.
Txawm li cas los xij, cov khib nyiab tsis nthuav lossis cog lus los ntawm cov nyiaj ntau vim yog lub siab no. Lub siab ntawm sab ntawm cov khoom, uas yog perpendicular mus rau qhov hnyav vector, yog ib txwm xoom. Yog li ntawd, cov khoom muaj nws tus kheej zoo, tsis zoo li cov kua, uas coj cov duab ntawm lub thawv.
Lub Siab Liquid yog dab tsi?
Yuav kom nkag siab lub tswv yim ntawm lub siab ntawm cov kua, peb yuav tsum xub to taub lub ntsiab lus ntawm lub siab. Lub siab ntawm cov kua dej zoo li qub yog sib npaug ntawm qhov hnyav ntawm cov kua kab saum toj kawg nkaus ntawm lub siab peb ntsuas. Yog li, lub siab ntawm cov kua dej zoo li qub (tsis ntws) tsuas yog nyob ntawm qhov ntom ntawm cov kua dej, qhov nrawm nrawm, qhov siab ntawm huab cua thiab qhov siab ntawm cov kua siab tshaj qhov ntsuas qhov siab. Tsis tas li ntawd, peb tuaj yeem txhais lub siab raws li lub zog quab yuam los ntawm kev sib tsoo ntawm cov khoom. Hauv qhov kev nkag siab no, peb tuaj yeem suav cov siab siv lub molecular kinetic txoj kev xav ntawm gasses thiab cov roj sib npaug. Lo lus "hydro" txhais tau tias dej thiab lo lus "static" txhais tau tias tsis hloov. Qhov no txhais tau tias hydrostatic siab yog lub siab ntawm cov dej tsis ntws. Txawm li cas los xij, qhov no kuj tseem siv tau rau cov kua dej, suav nrog gasses.
Vim tias lub siab hydrostatic yog qhov hnyav ntawm cov dej kem saum toj ntawm qhov ntsuas peb tuaj yeem muab rau hauv ib qho kev sib npaug li P=hdg, qhov twg P yog lub siab hydrostatic, h yog qhov siab ntawm qhov chaw ntawm cov kua. ntsuas taw tes, d yog qhov ceev ntawm cov kua thiab g yog qhov gravitational acceleration.
Daim duab 01: Siab ntawm kua
Tag nrho cov siab ntawm qhov ntsuas ntsuas yog kev sib koom ua ke ntawm hydrostatic siab thiab sab nraud siab (piv txwv li atmospheric siab) ntawm cov kua dej. Lub siab vim yog cov kua txav txav los ntawm cov kua dej zoo li qub. Peb tuaj yeem siv Bernoulli theorem los xam cov dynamic siab ntawm cov kua dej tsis muaj zog.
Qhov txawv ntawm Cov Khoom Siv thiab Cov Kua Dej yog dab tsi?
Qhov sib txawv tseem ceeb ntawm qhov siab ntawm cov khib nyiab thiab cov kua dej yog qhov siab ntawm cov khib nyiab tsuas yog vim qhov hnyav ntawm cov khoom, qhov siab ntawm cov kua tshwm sim vim qhov hnyav thiab txav ntawm cov kua molecules. Thaum xam cov kev ntxhov siab no, peb tuaj yeem xam qhov siab ntawm cov khib nyiab siv qhov hnyav ntawm cov khoom thiab lub siab ntawm cov kua siv ob qho tib si qhov hnyav ntawm cov kua thiab txav ntawm cov kua molecules. Thaum xav txog cov duab ntawm cov khoom khib nyiab thiab cov kua dej, cov khoom muaj qhov tseeb vim tias lub siab ntawm sab ntawm cov khoom, uas yog perpendicular rau qhov hnyav vector, yog ib txwm xoom thaum cov kua tau txais cov duab ntawm lub thawv vim tias cov kua siab ua rau ob sab. ntawm cov kua thiab hauv qab.
Summary - Siab ntawm Cov Khoom vs Ua Kua
Qhov sib txawv tseem ceeb ntawm qhov siab ntawm cov khib nyiab thiab cov kua dej yog qhov siab ntawm cov khib nyiab tshwm sim vim qhov hnyav ntawm cov khoom, qhov siab ntawm cov kua tshwm sim vim qhov hnyav thiab txav ntawm cov kua molecules.
