The change in is the amount of energy in a system that is available to do work.

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water

What does the law of conservation of mass state?

Which of the following is not an appropriate unit for acceleration? (kg/12 mihr? m/min/sec cm/30c?