1 . heat flow away from the emitting object by means of electromagnetic waves, mostly in the infrared region compressor 2 . the quantity of energy that a given mass of substance must absorb to increase its temperature by a specific amount convection 3 . heat flow due to the mass motion of a fluid entropy 4 . any material that reduces heat flow insulation 5 . a standardized measure of the ability to insulate R-value 6 . a pump that increases the pressure of a gas radiation 7 . a measure of disorder specific heat capacity