Normal human body temperature, also known as normothermia, is a concept that depends upon the place in the body at which the measurement is made, and the time of day and level of activity of the body. Although the value 37.0 C (98.6 F) is the commonly accepted average core body temperature, the value of 36.8±0.7 °C, or 98.2±1.3 °F is an average oral (mouth under the tongue) measurement. Rectal measurements, or measurements taken directly inside the body cavity, are typically slightly higher.