Question

2 Which units are used to measure:
a) volume? b) length?
d) time? e) temperature?

Answer 1

Answer:

Measurement of Time

The S.I. unit for time is second (s)

Other units for measuring time include: minute (min) and hour (h)

Some of the instruments used to measure time (especially in the laboratories) are: stopwatches, ticker tape timer

Stopwatches are the most commonly used instruments as they are quite accurate (to about 0.01 s), is cheap, easy and convenient to use

A ticker tape timer is more commonly used in physics experiments to analyse the motion of an object

Measurement of Temperature

The S.I. unit for temperature is Kelvin (K)

Other units for measuring temperature include: Celsius kelvin

Some of the instruments used to measure temperature: mercury thermometer, clinical thermometer, data logger with temperature sensor attached to it

A mercury thermometer can measure temperatures ranging from  

−

10 ∘ C  to  110 ∘ C , with each division measuring  1 ∘ C  change in temperature. It has an accuracy of  ± 0.5 ∘ C , is cheap and easy to use

A data logger is more commonly used in field experiments where the data is collected over long periods. The temperature measured is more sensitive and accurate than that from a mercury thermometer. (A data logger can also measure humidity of an environment, pH of fluids etc)

Measurement of Mass

The S.I. unit of mass is kilogram (kg)

Other units include: gram (g), tonne

Some of the instruments used to measure mass: beam balance, electronic balance

A beam balance is seldom seen in chemistry labs nowadays as compared to an electronic balance. The latter is precise (has an accuracy of up to 0.01 g) and fast in obtaining the mass

Measurement of Volume

The S.I. unit of volume is cubic metre ( m 3 ) units include: cubic centimeter( c m 3 ), litre (l), millilitre (ml) 1 litre (l) = 1 cubic decimetre ( d m 3 )=1000 cubic centimetres ( c m 3 ) 1000 litre (l) = 1 cubic metre ( m 3 )

Explanation:

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