1.1 Use of SI units and their prefixes

• The SI base unit for mass is the kilogram
• The standardization of SI units enables clear communication and comparison of data
• SI units ensure that experimental results are reproducible because they provide a standardized system
• The seven base SI units are fundamental for measuring physical quantities
• What is the symbol for the SI base unit of time?

  s
• What is the SI base unit for temperature?

  Kelvin
• What are SI prefixes used for?

  Large and small numbers
• What is the power of 10 associated with the prefix 'giga'?

  10⁹
• What is the unit symbol for the amount of substance?

  mol
• How many metres are in 1 kilometre?

  1000 metres
• What is the first step in converting between SI units using prefixes?

  Identify original unit
• Why are SI units essential for accurate measurements in science and engineering?

  Ensures universal understanding
• Base units ensure consistent and accurate measurements worldwide.


  True
• The SI system reduces ambiguity in scientific communication.


  True
• The SI base unit for length is the metre.


  True
• Match the SI base unit with its corresponding physical quantity:

  metre ↔️ Length

  kelvin ↔️ Temperature

  mole ↔️ Amount of substance

  candela ↔️ Luminous intensity
• Mastering SI unit symbols ensures that measurements are unambiguous and easily understood
• The SI base unit for electric current is the ampere
• The prefix 'kilo' corresponds to a power of 10³.


  True
• Match the prefix with its symbol and power of 10:

  kilo ↔️ k ||| 10³

  mega ↔️ M ||| 10⁶

  milli ↔️ m ||| 10^-3
• The SI base unit for electric current is the ampere, symbolized by A.

  True
• 1 millisecond is equal to 0.001 seconds.
• SI units reduce ambiguity in scientific communication.

  True
• How many SI base units are there?

  Seven
• What do SI base units enable in science and engineering?

  Clear and reliable communication
• Learning the symbols for SI base units is crucial for accurate communication of measurements.


  True
• What is the SI base unit symbol for length?

  m
• Match the SI base unit with its quantity:

  Length ↔️ m

  Mass ↔️ kg

  Time ↔️ s
• The prefix 'micro' corresponds to a power of 10^-6.
• The SI base unit for temperature is the kelvin.
• Match the prefix with its example:

  kilo ↔️ 1 kilometre = 1000 metres

  mega ↔️ 1 megahertz = 1,000,000 hertz

  milli ↔️ 1 millisecond = 0.001 seconds

  nano ↔️ 1 nanometre = 0.000000001 metres
• The power of 10 associated with the prefix 'nano' is 10^-9.

  True