# wet-and-dry-bulb thermometer

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Related to wet-and-dry-bulb thermometer: maximum and minimum thermometer

## wet-and-dry-bulb thermometer

an instrument used to measure the relative humidity of the atmosphere. It consists of a thermometer with a bulb that is wet or moist and one that is kept dry. The relative humidity is calculated from the difference in readings of the thermometers when water evaporates from the wet bulb, decreasing its temperature.

## thermometer

(ther-mom'et-er) [ thermo- + -meter]
An instrument for indicating the degree of heat or cold. thermometric (ther?mo-me'trik), adjective See: tables

### alcohol thermometer

A thermometer containing alcohol.

### Celsius thermometer

See: Celsius, Anders*Also called Centigrade.
Celsius*Fahrenheit
Boiling point of water100°212°
90194
80176
70158
60140
50122
40104
Body temperature37°98.6°
3086
2068
1050
Freezing point of water32°
-1014
-20-4
Conversion:Fahrenheit to Celsius: Subtract 32 and multiply by 5/9. Celsius to Fahrenheit: Multiply by 9/5 and add 32.
0322780.654129.281177.8
133.82882.45513182179.6
235.62984.256132.883181.4
337.43086.057134.684183.2
439.23187.858136.485185
5413289.659138.286186.8
642.83391.46014087188.6
744.63493.261141.888190.4
846.4359562143.689192.2
948.23696.863145.490194
10503798.664147.291195.8
1151.838100.46514992197.6
1253.639102.266150.893199.4
1355.44010467152.694201.2
1457.241105.868154.495203
155942107.669156.296204.8
1660.843109.47015897206.6
1762.644111.271159.898208.4
1864.44511372161.699210.2
1966.246114.873163.4100212
206847116.674165.2
2169.848118.475167
2271.649120.276168.8
2373.45012277170.6
2475.251123.878172.4
257752125.679174.2
2678.853127.480176

Celsius thermometer.
See: Celsius, Anders

### clinical thermometer

A thermometer for measuring the body temperature. See: clinical thermometry

### differential thermometer

A thermometer recording slight variations of temperature.

### Fahrenheit thermometer

See: Fahrenheit, Daniel Gabriel

### gas thermometer

A thermometer filled with gas, such as air, helium, or oxygen.

### Kelvin thermometer

See: Kelvin, Lord

### mercury thermometer

A thermometer containing mercury for measurement of temperature. Mercury thermometers are seldom employed because they are an important source of heavy metal pollution of rivers, streams, and aquatic life.

### recording thermometer

A device with a suitable sensor that continuously monitors and records temperature.

### rectal thermometer

A thermometer with a round bulb that is inserted into the rectum for determining body temperature.

### self-registering thermometer

A thermometer recording variations of temperature.

### spirit thermometer

A thermometer filled with alcohol for registering low temperatures.

### surface thermometer

A thermometer for indicating the temperature of the body's surface. Used, for example, in infant warmers.

### tympanic thermometer

A thermometer that determines the temperature electronically by measuring it from the tympanic membrane of the ear.
See: ear thermometry; temperature, tympanic

### wet-and-dry-bulb thermometer

Psychrometer.
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