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**Hint:**Temperature is an intensive quantity and represents the energy state of the matter. The standard unit of measuring temperature was first presented by William Thomson in 1848. It is also the base unit of temperature in the SI system (International System of Units).

**Complete answer:**

Temperature is an intensive quantity and represents the energy state of the matter. All objects are made of atoms and molecules that are in constant motion, the more they move, the more is the temperature of the object. A relatively easy definition of temperature is that the temperature of an object is defined by the average kinetic energy of its atoms and molecules.

The standard unit of measuring temperature is kelvin (K). Kelvin is referred to as the base unit of temperature in the SI system (International System of Units). William Thomson (Lord Kelvin) first presented the unit in 1848. It is defined as the fraction 1/273.16 of the thermodynamic temperature of the triple point of water (exactly 0.01 °C / 32.02 °F). The kelvin is frequently used in science and technology, but it is not that much used in everyday life. The Celsius unit is more often used in day to day life than kelvin and is very popular globally, although not so much used in the USA.

In the SI system, Celsius (°C) is currently a derived unit for temperature, kelvin being the base unit. The size of one °C is the same size as one kelvin. Swede Anders Celsius first presented the unit and the actual Celsius scale in 1742.

**Thus, the standard unit of measuring temperature is kelvin (K).**

**Note:**How do we know what is hot and what is cold?

- These terms hot and cold are not very scientific, so a more scientific approach was needed to find out the temperature. Therefore several scientific units and scales were developed.

- For high temperatures, the limit is undefined, and it is possible to reach a very high temperature. For example, the temperature at the surface of the sun is 5800 K, while the temperature inside the sun is up to 13.6 million kelvins.

- For the low end of temperature, the limit is defined, and it is the absolute zero temperature, which is the lowest possible temperature. But it is a theoretical state that is actually impossible to achieve. Absolute zero temperature is equal to 0 kelvin or-273.15 °Celsius.

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