There are actually more than 3, but only 3 are widely used today:* Kelvin - the SI unit. Used mainly in science.
* Celsius, also known as Centigrade: popularly used in most countries, outside the scientific community.
* Fahrenheit: Used mainly in the United States.
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3 X 3 X 2 = 18 cubic units.
3.5 units, or 3 units (to be pedantic).
Degrees Fahrenheit.
In itself it is none of them - it is just a number.However if some units are attached, it can be any of them:If its units are a linear measure, eg 472 m, it is a lengthIf its units are a square measure, eg 472 sq cm, it is an areaIf its units are a weight measure, eg 472 kg, it is massIf its units are a time measure, eg 472 seconds, it is timeIf its units are a temperature measure, eg 472 K, it is temperature.
Pour the 5 into the 3, there is now two units left in the 5 container. Add these two units to the 8 container. Repeat the process, and you have four units in the 8.