(i) Can a Vandrewaal's gas with a=0 be liquefied? Explain (ii) Deep sea divers ascend slowly and breath continuously by time they reach the surface. Give reason ?

(i) Can a Vandrewaal's gas with a=0 be liquefied? Explain (ii) Deep s

1.	(i) Can a Vandrewaal's gas with a=0 be liquefied? Explain (ii) Deep sea divers ascend slowly and breath continuously by time they reach the surface. Give reason ?
Answer» Solution :(i) 1. a=0 for a van der waals gas for a real gas. Van der waals constanta=0. It cannot be liquefied. 2 If a=0, there is a very less interaction between the molecules of gas. 3. "a" is the MEASURE of strength of Van der waals force of attractionbetween the molecules of the gas . 4. If a is equal to zero, the van der waals force of attraction is very less and the gascannot be liquefied. (ii)1. For every 10 m of depth a diver experiences an addtional 1 atm of pressure due to the WEIGHT of water SURROUNDING him. 2. At 20m, the diver ecperiences a total pressure of 3atm. So the most important RULE in diving is never hold breath. 3. Divers ,ust ascend slowly and breath continously allowing the regulator to bring the air pressure in their lungs to 1 atm by the time they reach the surface.