A thermometer which measures low temperatures.


Related Terms

MERCURY THERMOMETER

A liquid-in-glass thermometer or a liquid-in-metal thermometer using mercury as the liquid.

LIQUID-IN-GLASS THERMOMETER

A thermometer in which the thermally sensitive element is a liquid contained in a graduated glass envelope; the indication of such a thermometer depends upon the difference between the coefficients of thermal expansion of the liquid and the glass; mercury and alcohol are liquids commonly used in meteorological thermometers.

LIQUID-IN-METAL THERMOMETER

A thermometer in which the thermally sensitive element is a liquid contained in a metal envelope, frequently in the form of a Bourdon tube.

KATA THERMOMETER

An alcohol thermometer used to measure low velocities in air circulation, by heating the large bulb of the thermometer above 100 F (38 C) and noting the time it takes to cool from 100 to 95 F (38 to 35 C) or some other interval above ambient temperature, the time interval being a measure of the air current at that location.

INDEX THERMOMETER

A thermometer in which steel index particles are carried by mercury in the capillary and adhere to the capillary wall in the high and low positions, thus indicating minimum and maximum inertial scales.

SPAN

The algebraic difference between the upper and lower values specified as limiting the range of operation of a measuring instrument. Example: A thermometer intended to measure over the range -40 C + 60 C has a span of 100 C.

THERMOMETER

Device for measuring temperatures.

INSTRUMENT SHELTER

A cage or screen in which a thermometer and sometimes other instrument are placed to shield them from the direct rays of the sun and from other conditions that would interfere with registration of true conditions. It is usually a small wooden structure with louvered sides.

DRY-BULB TEMPERATURE

The temperature of the air, as indicated by the dry-bulb thermometer of a psychrometer.

DRY-BULB THERMOMETER

A thermometer with an uncovered bulb, used with a wet-bulb thermometer to determine atmosphere humidity. The two thermometers constitute the essential parts of a PSYCHROMETER.

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