Vapour Pressure
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Vapour Pressure
• All liquids vapourise or evaporate due to the molecules escaping from the free surface.
• When the liquid is contained in a closed vessel, the vapour molecules get accumulated in the space between the free surface and the top of the vessel.
• This accumulated vapor of the liquid exerts a partial pressur on the liquid surface is known as vapor pressur.
• If the pressure on liquid is equal to or less than vapor pressure, it starts boiling or vaporize.
• Higher the vapor pressure more volatile is the liquid, For example vapor pressure of petrol at 200C is 30.4 Kn/m2 while that of water is 2.345 Kn/m2, hence petrol vaporizes faster than water.
• As the temperature is increased, the vapor pressure is also increased.
• Mercury has very low vapor pressure and high density. Therefore, it is used as a numeric liquid.
Vapur pressure = Force/Area
S.I.unit: N/m2 or ML-1T-2
For more help in Vapour Pressure click the button below to submit your homework assignment
• When the liquid is contained in a closed vessel, the vapour molecules get accumulated in the space between the free surface and the top of the vessel.
• This accumulated vapor of the liquid exerts a partial pressur on the liquid surface is known as vapor pressur.
• If the pressure on liquid is equal to or less than vapor pressure, it starts boiling or vaporize.
• Higher the vapor pressure more volatile is the liquid, For example vapor pressure of petrol at 200C is 30.4 Kn/m2 while that of water is 2.345 Kn/m2, hence petrol vaporizes faster than water.
• As the temperature is increased, the vapor pressure is also increased.
• Mercury has very low vapor pressure and high density. Therefore, it is used as a numeric liquid.
Vapur pressure = Force/Area
S.I.unit: N/m2 or ML-1T-2
For more help in Vapour Pressure click the button below to submit your homework assignment