thermometer

Instrument for measuring temperature by means of a substance (usually a liquid or a gas) contained in a graduated tube.

alcohol bulb

Glass reservoir containing colored alcohol (methanol, ethanol) that expands and rises in the capillary bore as the temperature rises.

F degrees

Symbol representing a unit of measurement on the Fahrenheit scale (Fahrenheit degree).

alcohol column

Quantity of alcohol that is contained in the glass tube; its height varies with the temperature.

Fahrenheit scale

Temperature scale that is used in some English-speaking countries, on which the freezing point of water is at 32 and the boiling point at 212.

C degrees

Symbol representing a unit of measurement on the Celsius scale (Celsius degree).

Celsius scale

Temperature scale that is based on a graduation from 0 (freezing point of water) to 100 (boiling point of water); it was formerly called the centigrade scale.