🔍 What are Physical Quantities?
Physical quantities are properties that can be measured and have numerical values with units.
📏 Types of Physical Quantities
- Fundamental Quantities: Length, Mass, Time, Temperature, Electric Current, Amount of Substance, Luminous Intensity
- Derived Quantities: Area, Volume, Speed, Acceleration, Force, Pressure
📐 Common Units
- Length: meter (m), centimeter (cm), millimeter (mm)
- Mass: kilogram (kg), gram (g)
- Time: second (s), minute (min), hour (h)
- Temperature: Celsius (°C), Kelvin (K)
🎯 Measurement Rules
- Always include units with measurements
- Use appropriate measuring instruments
- Record measurements accurately
- Consider significant figures
🔧 Common Measuring Instruments
- Ruler/Scale: For measuring length
- Balance: For measuring mass
- Stopwatch: For measuring time
- Thermometer: For measuring temperature
- Measuring Cylinder: For measuring volume