<Li> Heat death paradox </Li> <Li> Loschmidt's paradox </Li> <Tr> <Th> Theories </Th> </Tr> <Tr> <Td> <Ul> <Li> Caloric theory </Li> <Li> Theory of heat </Li> </Ul> <Ul> <Li> Vis viva ("living force") </Li> <Li> Mechanical equivalent of heat </Li> <Li> Motive power </Li> </Ul> </Td> </Tr>

Which of these conditions is not required for a gas to be considered ideal