Degrees of temperature refer to the numeric values used to indicate the level of hotness or coldness of an object or environment. There are numerous synonyms that can be used to describe degrees of temperature, including Celsius, Fahrenheit, Kelvin, heat units, and thermal units. These synonyms are used interchangeably in scientific and technical contexts across the globe. Celsius is the standard unit of temperature used in countries that have adopted the International System of Units (SI), while Fahrenheit is preferred in the United States. Kelvin, on the other hand, is used in scientific research primarily to measure very high or very low temperatures. Heat units and thermal units are both broader terms for any measure of heat.