A laboratory thermometer consists of a long glass tube filled with mercury or colored alcohol, featuring a bulb at one end. It has a graduated scale for measuring temperatures typically ranging from -10°C to 110°C.
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To convert Celsius to Kelvin, add 273.15 to the Celsius temperature. The formula is: K = °C + 273.15 This conversion reflects the difference in the starting points of the two temperature scales.
Celsius is named after Anders Celsius, who devised the scale based on the freezing and boiling points of water. Fahrenheit honors Daniel Gabriel Fahrenheit, while Kelvin is named after Lord Kelvin, who introduced absolute temperature.
The normal body temperature of a healthy human is approximately 37.0 °C, representing the average internal temperature. This value is essential for optimal metabolic functions, enzymatic reactions, and overall physiological processes within the body.
Body temperature varies due to several factors, including age—infants typically have higher temperatures—time of day, as it tends to be lower in the morning and higher in the evening, and activity level, affecting metabolic heat production.