Measurement in science

• Density


  Mass per unit volume
• Density values


  • 1g/cm³
  • 1000kg/m³
• Calculating density


  Density = mass / volume
• The triangle formula is: mass = density x volume
• Volume = mass / density
• A physical quantity is one that can be measured.
• A physical quantity consists of a magnitude (numerical value) and a unit.
• Examples of physical quantities:

  1. Length
  2. Area
  3. Volume
  4. Mass
  5. Temperature
  6. Time
• Regular Solid

  A solid that has a well defined shape
• Regular objects

  • Cube
  • Cuboid
  • Cylinder
  • Sphere
• Irregular solid

  A solid that does not have a well defined shape, it has an irregular shape
• Irregular objects

  • Stones
  • Seashells
• Measurement of volume:

  Volume is defined as the amount of space occupied by a body.
• The SI unit of volume is cubic metre. (m³)
• Meniscus:

  The curved upper surface of a liquid in a tube.
• Measurement of mass:

  Mass is defined as the amount of matter present in a body.
• The SI unit of mass is kilogram. (Kg)
• Apparatus used to measure mass:

  1. Beam balance
  2. Compression balance
  3. Electronic balance