Between 66 and 78 degrees Fahrenheit (20 to 25 degrees Celsius) is considered room temperature, according to the West Midlands Public Health Observatory in the U.K. The average value of 23 degrees Celsius is commonly given as this temperature, although there is no formal agreement among scientists on a single temperature called "room temperature."
"Room temperature" is a colloquial expression used to describe the temperature range that corresponds to the maximum bodily comfort of the average person. Most adjustable indoor climate conditions are adjusted to around this temperature. In most contexts, the term can be used interchangeably with ambient temperature. WebMD and the Huffington Post state that 65 to 72 degrees Fahrenheit is the ideal temperature range for comfortable slumber.
Room temperature is sometimes confused with a more rigorously defined scientific parameter called "standard temperature," often accompanied by the notion of standard atmospheric pressure. Standard temperature and pressure are defined by the International Union of Pure and Applied Chemistry as exactly 25 degrees Celsius and 0.987 atmospheres. Scientists use this standard set of conditions to enable comparison between different sets of experimental values. The behavior of gases in particular changes considerably as temperature and pressure are varied, making it especially important to fix these values to standard temperature and pressure or other standard values when conducting experiments.