When a gas is subjected to adiabatic expansion, it gets cooled due to________?

The valve commonly used in pipes larger than 2′′ dia is a________?

Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank)?

Atomic ________ is a whole number for an element?

Na2CO3 is called ________?

Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a________?