Question

What is critical temperature ,critical velocity,critical angle?

Answer 1

1)The temperature At which gas can't be liquefied by pressure alone is called as critical temperature.
2)Critical velocity means speed at which gravitational pull on object and air resistance on object gets equalized.
3)Angle of incidence beyond which rays passing through denser medium to less dense medium are no longer refracted but totally get reflected

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Answer 2

critical temperature- the temperature of a gas in its critical state, above which it cannot be liquefied by pressure alone.

critical angle - the angle of incidence beyond which rays of light passing through a denser medium to the surface of a less dense medium are no longer refracted but totally reflected

critical velocity - is the speed that a falling object reaches when gravity and air resistance equalize on the object. ... constant velocity of a superfluid in capillaries which is equivalent to the bandgap width divided by the fermi momentum