Volume
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1
What is volume?
Volume is a property associated with cubic measure.
2
What is the unit of volume?
The unit of volume is the cubic metre (m³) along with its multiples and submultiples.
3
What is an alternative unit of volume?
The litre (L) is sometimes used as an alternative unit of volume.
4
How many cubic decimetres are in one litre?
1 litre = 1 cubic decimetre (1 dm³).
5
Is the litre a preferred SI unit?
No, the litre is a non-preferred SI unit, but it is commonly used.
6
What happens when the volume of a substance increases?
The substance is said to have expanded.
7
What happens when the volume of a substance decreases?
The substance is said to have been compressed.
8
What is specific volume?
Specific volume is the volume occupied by a unit mass.
9
What is the basic unit of specific volume?
The basic unit of specific volume is cubic metres per kilogram (m³/kg).
10
What is the reciprocal of density?
Specific volume is the reciprocal of density.
11
In what other units can specific volume be expressed?
Specific volume can be expressed in cubic metres per tonne (m³/t) and litres per kilogram (L/kg).
12
What symbol represents specific volume?
Specific volume is given the symbol “v”.
13
What is energy?
Energy is the capacity for doing work.
14
How is energy measured?
Energy is measured by the work done in a given time.
15
In what units is energy expressed?
Energy is expressed in joules (J), kilojoules (kJ), and megajoules (MJ).
16
What is another useful unit of energy?
The kilowatt-hour (kWh) is another useful unit of energy.
17
What does 1 kWh represent?
1 kWh represents the energy used when 1 kilowatt of power is exerted continuously for 3600 seconds (1 hour).
18
What is the formula for energy?
Energy = power × time.
19
How many joules are in 1 kWh?
1 kWh = 3.6 × 10⁶ J = 3.6 MJ.
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