Physical Quantities - Notes

Physical quantities are properties of materials or systems that can be measured. Here’s a breakdown of key points:

Types of Physical Quantities

• Fundamental Quantities: Basic units like length, mass, and time, defined under SI units.
• Derived Quantities: Formed by combining fundamental quantities, e.g., speed (distance/time).
• Supplementary Quantities: Includes:
  • Solid Angle: Measured in steradian.
  • Plane Angle: Measured in radian.

SI Units

Initially introduced in 1960 with six units: meter, kilogram, second, ampere, kelvin, and candela. A seventh unit, mole, was added in 1971.

Key Fundamental Quantities

• Length (meter)
• Mass (kilogram)
• Time (second)
• Temperature (kelvin)
• Electric Current (ampere)
• Luminous Intensity (candela)
• Amount of Substance (mole)

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