Why should gases be insulators at ordinary pressure and start conducting at very low pressure?

Comment on the statement that all gases behave in ideal manner at low pressure and high temperature.

Why should an ammeter have a low resistance?

Why don't we feel effect of atmoshpheric pressure?

Equal volumes of gases at the same temperature and pressure contain equal number of particles. This statement is a direct consequence of

Why liquids exert pressure on the walls of the containing vessel?

Explain why (or how): In a sound wave, a displacement node is a pressure antinode and vice versa,