| A | B |
| viscosity | the resistance of a gas or liquid to flow |
| kinetic energy | the energy of motion |
| pressure | the amount of force per unit area of a surface |
| buoyant force | the upward force exerted on an object immersed in or floating on a liquid |
| evaporation | the change of a substance from a liquid to a gas |
| condensation | the change of a substance from a gas to a liquid |
| Archimedes' Principle | states that the buoyant force on a object in a fluid is an upward force equal to the weight of the volume of fluid that the object displaces |
| fluid | a non-solid state of mater in which the atoms or molecules are free to move past each other, as in a gas or liquid |
| energy | the capacity to do work |