Introduction to Units
Anything that is used as a standard for the measurement of any quantity is called a Unit.
System International Units (SI) is the standard system that is used all over the world to measure units.
Units of Some Elements
Length: Length is a term to identify the size of an object or the distance from 1 point to another point. The SI Unit of Length is m (meter).
Mass
Mass is the quantity of matter in a body; it can be a human body, an animal body, or anything’s body. We measure Mass in Grams (g) or kilograms (kg), 1 kilogram = 1000 grams. Kilo Means Thousand.
Time
In physics, time is always measured in seconds (s). We can count seconds very roughly, without a watch, by saying at a steady rate: ONE Thousand, TWO Thousand, and THREE Thousand, etc…
Fundamental SI Units
The Other units are based on these four units: Meter (m), Gram (g) or Kilo Gram (kg), and Second (s).
