The Kelvin scale is used by physicists and other scientists who need to record very precise temperatures. Water freezes at 32 degrees Fahrenheit and boils at 212 degrees Fahrenheit. However, even in these countries, scientists use the Celsius or kelvin scale to measure temperature. The United States, Burma, and Liberia use the Fahrenheit scale to measure temperature. Three nations do not use the Celsius scale. Zero degrees Celsius is the freezing point of water, and 100 degrees Celsius is the boiling point of water. Most scientific fields measure temperature using the Celsius scale. The metric system, including Celsius, is the official system of measurement for almost all countries in the world. The metric system of measurement also includes units of mass, such as kilograms, and units of length, such as kilometers. The Celsius scale is part of the metric system. The three most common units of measurement for temperature are Celsius, Fahrenheit, and kelvin. It can measure the temperature of a solid such as food, a liquid such as water, or a gas such as air. A thermometer is an instrument that measures temperature.
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