Variation in the body Temperature

Clinical Application of Temperature Measurement

A class of materials called thermo chromic materials change color as their temperature increases and they change from the liquid phase to a semi crystalline ordered state. These liquid crystals can be incorporated into plastics or paints, and can be used to monitor the temperature of the products or packages in which they are incorporated.

also , it s well know normal body temperature is considered to be 37.0 °C, although it varies throughout the day and from person to person. Oral temperatures of 36.1 °C are common in the morning and climb to a high of 37.2 °C between 6 p.m. and 10 p.m.
Temperatures above 37.2 °C for a person at rest are usually an indication of illness.
Individuals who are involved in prolonged exercise may also experience elevated temperatures.
Body temperatures of marathon runners can range from 39 °C to 41 °C as heat production during exercise exceeds the body’s ability to lose heat. Changes of more than 3.5 °C from the normal body temperature begin to interfere with bodily functions.

Body temperatures above 41 °C, hyperthermia, can lead to convulsions, particularly in children, which may cause permanent brain damage.
Heatstroke occurs above 41.1 °C. Sweat production stops, and the skin becomes hot and dry. The pulse rate is elevated, and respiration becomes weak and rapid.
The person can become lethargic and lapse into a coma. Damage to internal organs is a major concern, and treatment, which must be immediate, may include immersing the person in an ice-water bath