The rate of change of angular displacement with time.

The ratio of water vapor in a sample of air to the volume of the sample.

The temperature of - 273.16 or 0 K at which molecular motion vanishes.

The ratio of the total absorbed radiation to the total incident radiation.

The rate of change of velocity with respect to time.

The acceleration imparted to bodies by the attractive force of the earth or any other heavenly body.

capable of transmitting light without decomposing it into its constituent colors.

The science of the production, transmission and effects of sound.

A sound barrier that prevents the transmission of acoustic energy.

Any change in which there is no gain or loss of heat.