A) Are viscous
B) Possess surface tension
C) Are compressible
D) Possess all the above properties
A) Air present in atmosphere at NTP conditions
B) Air required for complete combustion of fuel with no excess air
C) Air required for optimum combustion so as to have reasonable excess air
D) None of the above
A) Solid and vapour phases are in equilibrium
B) Solid and liquid phases are in equilibrium
C) Liquid and vapour phases are in equilibrium
D) Solid, liquid and vapor