| Bimetallic Measuring element | Two different metal bands are pressure-welded together. The different heat-expansion-coefficients of these metals cause a temperature-dependent bend of this metal-compound. This bend resp. deflection is a measure for the available temperature. | ||
| Soil Thermometer | Measuring instrument to measure the air temperature in soil at different depths. | ||
| Soil Surface Thermometer | Measuring instrument to measure the air temperature above the soil, preferably at a height of 5 cm. The German Weather Service (DWD) uses sensors without radiation protection only to measure the minimum temperature. | ||
| Extreme Thermometer | Combination of a min.- and a max. thermometer to measure the current, the lowest and the highest temperature of the preceding measurement period. | ||
| Perceived Temperature | The ambient temperature as perceived by the human body by wind influence. It is calculated from the “Windchill Factor”. | ||
| Max.-Thermometer | Mercury thermometer to measure the current temperature and the highest temperature of the preceding measurement period. When the temperature drops, the highest temperature reached is indicated by a mark. | ||
| Min.-Thermometer | Alcohol thermometer to measure the current temperature and the lowest temperature of the preceding measurement period. A dark pin in the alcohol thread is pushed back by the surface tension of the alcohol and remains stationary when the temperature increases. The thermometer is used in a horizontal position. | ||
| Pt 100 Resistance Thermometer | The temperature-dependent change in resistance of a measurement coil made of platinum is used as a measure of temperature. 100 Ω for 0°C is usually taken as basic value (Pt 100). The resistance values are standardized in the IEC 751, depending on the temperature(class A corresponds to ±0,15 K; class B corresponds to ±0,3 K). | ||
| Temperature transmitter | Electrical temperature measuring instrument with electrical measuring value output. | ||
| Thermograph | Measuring instrument which mechanically record the temperature as a function of time. | ||
| Thermometer | General term for a temperature measurement instrument. | ||
| Windchill | The loss of heat by the human body [W/m²].through the wind. The “perceived temperature” is derived from this factor. | ||
| Units | Kelvin [K] | Used since 1976 as the legal unit of temperature. It starts at -273,15 °C. | |
| Celsius [°C] | Common temperature degree scale, where a thermometer indicates 0 °C when immersing its ball into melting ice and indicates 100 °C with immersion into boiling water, at an air pressure of 1013,2 mbar. | ||
| Fahrenheit [°F] | Temperature scale frequently used in Anglo-Saxon countries. On this scale, the melting point of ice is 32 °F. | ||
| Conversions | °C = K -273,15 K | K = °C +273,15 °C | |
| °C = 5/9 (°F -32) | °F = 32 + 9/5 °C | ||
