Name the instrument and the SI unit that are used to measure each of the following physical quantities.

Here are the answers to the measurement questions:

1. Name the instrument and the SI unit that are used to measure each of the following physical quantities.

Quantity	Measuring instrument	SI Unit
Mass	Electronic balance	Kilogram (kg)
Weight	Spring balance	Newton (N)
Temperature	Thermometer	Kelvin (K)
Electric potential	Voltmeter	Volt (V)
Luminous light intensity	Lux meter	Candela (cd)
Time	Stopwatch	Second (s)
Atmospheric pressure	Barometer	Pascal (Pa)
Density of liquid	Hydrometer	Kilogram per cubic meter (kg/m³)
Humidity	Hygrometer	Dimensionless (e.g., %)
Length of an exercise book	Ruler	Meter (m)
Electric current	Ammeter	Ampere (A)

2. Identify each of the following laboratory instruments and state one use of each.

• a)
  • Instrument: Digital balance
  • Use: To measure the mass of substances accurately.
• b)
  • Instrument: Mechanical kitchen scale
  • Use: To measure the mass of ingredients or objects.
• c)
  • Instrument: Spring balance
  • Use: To measure weight or force.
• d)
  • Instrument: Burette
  • Use: To deliver variable, precise volumes of liquid in titrations.