Welcome to The Happy Camper Club. Happy Camper is a discount club for RVers and campers of all types. As a member, you can stay at over 1,200 quality RV parks on a full hook-up site for up to half price; and unlike other memberships, it requires no contracts, no home parks, and no point systems.
Level of liquid or gas in the tube â The appropriate volume of liquid or gas in the tube depends on the expansion coefficient of the substance used, the area of the capillary and the range of temperature required. Bimetal or bi-metallic thermometers use a bimetal spring as the temperature-sensing element.
They include the thermal expansion of solids or liquids with temperature, and the change in pressure of a gas on heating or cooling. Radiation-type thermometers measure the infrared energy emitted by an object, allowing measurement of temperature without contact. Most metals are good conductors of heat and they are solids at room temperature. Mercury is the only one in liquid state at room temperature, and has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer. This is the reason behind mercury being used in thermometer. Some of the principles of the thermometer were known to Greek philosophers of two thousand years ago.