Vakiopainelämpömittari

Vakiopainelämpömittari, also known as a constant pressure thermometer, is a type of thermometer designed to measure temperature under conditions where the pressure of the working fluid remains constant. This is in contrast to other thermometers that may operate under changing pressure conditions. The principle behind its operation typically involves the thermal expansion or contraction of a working substance.

In a vakiopainelämpömittari, a sealed vessel contains a fluid, such as a gas or liquid. As the temperature changes, the volume of this fluid changes to maintain constant pressure. This volume change is then translated into a temperature reading through a calibrated scale. For instance, a gas thermometer of this type might use the relationship between volume and temperature at constant pressure (Charles's Law) to determine the temperature.

These thermometers are often used in scientific research and industrial applications where precise temperature control and measurement are critical, especially when the process being monitored requires stable pressure. They can offer high accuracy and a wide temperature range depending on the choice of working fluid. The design ensures that the pressure exerted by the fluid is kept at a predetermined level, allowing for a more direct correlation between volume and temperature. Calibration is a crucial step to ensure the accuracy of the temperature readings provided by a vakiopainelämpömittari.