-i-Physical Quantity


Physical Quantities

A physical quantity is a property of an object that can be measured with a measuring instrument.

A physical quantity is usually expressed as “a magnitude (numerical value) and a physical unit or more


Normal body temperature of a healthy human being is 37 0C


37      is the number (value) +

0C       is the unit


Systems of units

We had several systems for units which might still be used in some countries.

SI units “International system of units”


Basic SI units (we will start only with three of them)

Quantity Name of SI Unit Symbol Device used to measure
Length meter m Meter rule
Mass kilogram kg Balance
Time second s Stopwatch

the first three is enough for starting our course, the rest will be studied later


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