chemistry through riddles


Riddle # 5
I am a simple physical property of all
gasses, which can be recorded by a
thermometer. My value is fixed for each
gas and I play an important role in
liquefaction of gases by application of
high pressure. You can write my
Expression by using Van der Waal
constants a and b.

Questions

(a)  Who  am I ?
(b)  How am I related to liquefaction of
       gases by high pressure ?
(c)   What is my relation with a and b ?
(d)  What is the status of liquid and vapor
       phase of a substance when the gas
       attains my value ?      

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