| fever |
a body temperature higher than normal that is usually caused by illness. |
| flash point |
the lowest temperature at which a combustible liquid will give a flash of light when heat is applied. [1/2 definitions] |
| foam |
a lightweight, man-made material with many tiny air holes, used especially for packaging or for keeping things at a preferred temperature. [1/6 definitions] |
| freeze |
to store food at a very low temperature so that it becomes solid and able to be preserved for a lengthy period of time. [1/17 definitions] |
| freeze-dry |
to preserve (foods, blood plasma, or the like) by rapid freezing and then drying in a high vacuum at a low temperature. |
| freezing |
at or near the temperature at which water turns to ice. [1/2 definitions] |
| freezing point |
the temperature at which a given liquid freezes. |
| frost |
the condition produced when the air temperature falls below the freezing point of water, or the temperature at which this happens. [1/5 definitions] |
| gallium |
a silvery metal chemical element that has thirty-one protons in each nucleus, usu. forms a trivalent ion, and is often used in pure form in high-temperature thermometers because it melts at just above room temperature and remains liquid up to 1983 degrees Celsius. (symbol: Ga) |
| gas |
matter that is neither liquid nor solid and expands or contracts rapidly and uniformly with temperature changes. [1/14 definitions] |
| gradient |
in physics, a measure of the greatest rate by which a variable, such as pressure or temperature, changes with a change in position. [1/4 definitions] |
| heat |
in physics, a form of energy transfer measured by temperature differences between one system, object, or medium, and another. [1/13 definitions] |
| heat pump |
a device for heating or cooling a building by transferring heat from a low-temperature reservoir by means of a compressor and a heat exchanger. |
| hothouse |
a heated glass building used to grow plants that require a constant warm temperature. [1/2 definitions] |
| hot spring |
a natural spring that has water warmer than body temperature. |
| humidity |
the amount of water vapor in the air, relative to the greatest amount possible at a given temperature; relative humidity. [1/2 definitions] |
| hyperthermia |
abnormally high body temperature. |
| hypothalamus |
the part of the brain below the thalamus in the ventral region of the diencephalon, important in the regulation of the autonomic nervous system and body temperature. |
| hypothermia |
a condition of very low body temperature. |
| incubator |
a warm container that protects and helps babies that are sick or born too early. An incubator allows doctors to control the temperature, amount of oxygen, and other conditions that affect a baby's health. [1/2 definitions] |
| inert gas |
any of a group of chemical elements, such as helium and neon, that seldom form compounds with other elements and that are gases at room temperature. |