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Determine the rms speed of air molecules...

Determine the rms speed of air molecules at STP Given density of mercury `=13.6 g.cm^-3` density of air `=0.00129 g.cm^-3`.

Text Solution

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`p=76 times 13.6 times 980 dyn.cm^-2`
`p=0.00129 g. cm^-3`
`thereforec=sqrt((3p)/p)`
`=sqrt((3times76times13.6times980)/0.00129)`
`=4.85 times10^4 cm.s^-1=0.485 km.s^-1`.
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