Room temperature is the required temperature in a room
The room temperature is a broad term approximately between 15 and 26 degrees Celsius. Often there is a product that has to be kept at room temperature, which means that it must be kept outside the refrigerator, but not in the bright sun. For wine, the room temperature is about 18 degrees (the temperature as it used to be in the living room). In Physics and chemistry the one time is 25 degrees, and the other times 20 degrees Celsius is meant. Values for behaviour and properties of materials and chemical substances are generally given in tables at 1 of these temperatures. At most people at home the room temperature is around 20 degrees (sometimes 19, sometimes 21).