Glossary of Medical Terms

Our online medical glossary of medical terms and definitions includes definitions for terms related to treatment, and general medicine


Energy transferred by mechanical means, force acting over a distance. For chemical systems the sign for work is positive, if work is done on the system and negative, if work is done by the system. An example is the expansion of a gas against the outside, atmospheric pressure. In this case work is negative, because it is done by the gas which represents the system.
radian   radiant   radiant energy   radiant heat   radiant intensity   radiary   radiata   radiate   (2)
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