kaasulämpömittari

Kaasulämpömittari is a type of thermometer that utilizes the relationship between the pressure and temperature of a gas at constant volume. In this design, a fixed amount of gas is enclosed in a bulb and connected to a manometer. As the temperature changes, the gas inside the bulb expands or contracts. Since the volume is kept constant, this change in volume manifests as a change in pressure. The manometer, which typically contains mercury, measures this pressure difference. The height difference of the mercury columns in the manometer is directly proportional to the pressure of the gas, and thus, to its temperature. Calibrating the instrument involves marking the mercury levels at known temperatures, such as the freezing and boiling points of water. Kaasulämpömittarit are known for their high sensitivity and accuracy, particularly over a wide range of temperatures. They are often used in scientific research and calibration laboratories where precise temperature measurements are critical. The principle relies on Gay-Lussac's Law (or Amontons' Law), which states that for a fixed amount of gas at constant volume, pressure is directly proportional to absolute temperature.