What is temperature: Define, Importance, Measurement & Unit

A measure of hotness and coldness in degrees. The atoms and molecules in a substance do not always travel at the same speed. Temperature is measured with a thermometer which covers the readings into degrees on a temperature scale. The temperature is a measure of the average heat or thermal energy of the particles in a substance. As it is the average measurement it does not depend on the number of particles in an object neither it depends on the size of it. Temperature can mean different things in different situations. For example, the molecules are traveling in random directions at a variety of speeds – some are fast and some are slow.

Importance of temperature:

Importance of temperature

Temperature plays a major role in medical care in both human and animals. Temperature measurement is important in different industries. It will also detail different types of temperature measurement equipment. Temperature has been found to affect the living organisms in various ways, for example, it has a significant role on the cells, morphology, Physiology, behavior, growth, ontogenetic development and distribution of plants and animals. Temperature defines how hot or cold something is and helps us prepare for the weather.

How is a temperature measured?

How is a temperature measured

Temperature is measured and displayed in two different units depending on what country you live in. The United States uses the Fahrenheit scale, and the rest of the world uses the Celsius scale. Each scale gives a different number for a particular measure of temperature. The Celsius scale is based on the freezing point of water is 0 degrees and the boiling point being 100 degrees while the Fahrenheit scale has water freezing at 32 degrees and water boiling at 212 degrees. When we measure the temperature of air, liquids or objects using a thermometer most thermometers have small tubes and a bulb of liquid at the bottom. The hotter the temperature, the higher the liquid from the bulb rises in the tube. There are markings on the side of the glass tube that show the temperature.

Temperature unit:

Temperature unit

Units of the temperature: from Fahrenheit to Celsius to Kelvin and back. Degrees Fahrenheit, (developed in the early 1700’s by G. Daniel Fahrenheit), are used to record surface temperature measurements by meteorologists in the United States. It states the temperature of the heating energy.

 Measurement of the temperature:

 Measurement of the temperature

Common scales of the temperature measured in degrees: Celsius (°C) Fahrenheit (°F) Rankine (°R or °Ra), which uses the Fahrenheit scale, adjusted so that 0 degrees Rankine is equal to absolute zero.

Unit of heat:

Unit of heat

As a form of energy, heat has the unit joule (J) in the International System of Units (SI). However, in many applied fields in engineering, the British thermal unit (BTU) and the calorie are often used. The standard unit for the rate of heat transferred is the watt (W), defined as one joule per second.


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