Body Temperature, Energy and Heat Loss

A physiological variable like temperature varies depending on when, where and with what it is measured. All the temperature values are accurate measurements of the body site used. Just be sure that you measure the same site with the same instrument if you want to compare the value with a previously measured value.

The lack of wind minimises convective loss, while the light clothing prevents conductive loss to the chair and ground. The low temperature means that sweating is not occurring. Radiative loss will occur as the body temperature is greater than that of the surroundings.

Heat loss through radiation (of infrared radiation) occurs continuously despite being clothed. Heat loss by conduction is low as clothes are insulators and also decrease convection losses. Sweating will be absent in an air-conditioned lecture theatre.

The reverse is true as W = F × s.

This is considered the usual healthy range. Above 38 is a fever (except if as a result of vigorous exercise), while below 35 is hypothermia.

When a force causes an object to move, work (in joules) has been done to the object. The work done changes the amount of energy (in joules) stored in an object.

The heat transferred to them will be the same as the Bunsen burner flame was the same as was the time of heating. Their temperatures will be different as the greater volume of 200 ml of water requires more heat to reach the same temperature as the smaller volume.

Heat will be lost by radiation even through clothing. A person may seek a cool environment to maximise their heat loss to the environment, so their behaviour may influence heat loss. A silver foil lining will reflect infrared radiation back towards the body.

If the most energetic water molecules depart, the remainder will have a lower average energy than before the fastest ones evaporated. This means that the temperature of the remaining sweat will be lower.

The energy value of food is stored in the chemical bonds within the food molecules.