Measurements (chp.29)

• What is the primary purpose of measurement in science?

  To obtain accurate and precise values
• Why do we use instruments for measurement instead of relying solely on our senses?

  Instruments provide more accurate measurements than our senses, which can be inaccurate
• What is the definition of length in measurement?

  Length is the distance between two points
• What instruments are commonly used to measure length?

  • Ruler/metre stick
  • Callipers
  • Opisometer
  • Measuring tape
  • Vernier callipers
  • Trundle wheel
• What are the Scientific International Units (S.I. units) of length?

  Millimetre (mm), centimetre (cm), metre (m), kilometre (km)
• How many millimetres are in one centimetre?

  10 mm = 1 cm
• How many centimetres are in one metre?

  100 cm = 1 m
• How many metres are in one kilometre?

  1000 m = 1 km
• What is the "error of parallax" in measurement?

  It occurs when the angle of view affects the reading