Calculator for conversions between temperature units.
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Definition

Temperature
Temperature is a measure of the average kinetic energy of the particles in an object or environment. The kinetic energy is related to the motion of particles. Greater kinetic energy means that the particles are moving faster and cause the temperature to increase. In an environment with fewer moving particles, such as at the top of Mount Everest, the temperature would be lower. The SI unit of temperature is the kelvin (K). Other commonly used units of temperature are the Celsius or Centigrade (°C) and the Fahrenheit (°F).

Why is the air denser at the sea level? You may ask. More air particles are at the sea level because the gravitational force is stronger near the Earth's surface, which keeps more air particles and makes the air denser at lower elevations.
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Trivia  •  Fun Facts

Do you know?
Why is it colder at the top of Mount Everest than at the sea level?
You may think that it would be hotter (higher temperature) at the top of the world's highest mountain since the spot is closer to the Sun. Actually, it is cold at the top of Mount Everest because the air is thinner, with fewer air particles, at higher elevations. Temperature is affected by the amount of particles in an environment.