Measuring and Comparing Capacity - Orchids The International School
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Measurements

Measuring and Comparing Capacity

Capacity: The capacity of a vessel/container is the quantity of liquid or matter it can hold. We use measuring spoons or measuring jugs to measure capacity.

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  • We often measure capacity in litre or millilitre.
  • We measure a small quantity of liquid like perfume, medicine etc. in millilitres (mL) and a large quantity of liquid like milk, water, oil etc. in litres (L).
  • The standard unit of measuring liquid is ‘Litre’.

Measure liquid using measuring cup

  • First place the measuring cup in a flat surface
  • Then pour the liquid in the measuring cup. Measuring cups are marked with standard measuring units on their body.
  • Now bend down eye level to the marks on the body of the measuring cup and watch carefully where the surface of the liquid touches the line.
  • That line signifies the measurement of the liquid.

The picture given below show the process for measurement of liquid.

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The cup above has 4.5 mL of liquid. In the similar way we can measure the liquid in a cylinder.

Relation between L and mL

We know that 1 L = 1000 mL.

So, to convert litre to millilitre, we need to multiply litre with 1000.

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Examples:

Convert from L to ml: (i) 45 L (ii)10 L

Answer:

  1. 45 L = 45 × 1000 ml = 45000 ml
  2. 10 L = 10 × 1000 ml = 10000 ml

Real-Life Problems

Examples 1:

There are 6 bottles of oil in a retail shop and each bottle contains 375 mL oil. The shop keeper has sold 750 mL oil. How much oil is left in the shop?

Answer:

In 6 bottles, there is total 6 × 375 mL = 2250 mL oil.

If 750 mL oil is sold, then the total amount of oil left is:

2250 ml – 750 ml = 1500 ml

∴ So, 1500 ml oil is left in the shop.

Examples 2:

Soma and Ram bought a packet of 500 ml milk each. Tarru and Jumbo bought a packet of 1L milk each. They poured the milk in a container and distributed the total milk between 6 children. How much milk did each of the children get?

Answer:

Soma and Ram bought total 2 × 500 ml = 1000 ml

Tarru and Jumbo bought total 2 × 1 L = 2 L

Now, 2 L = 2000 ml

They poured the total milk in the container.

So, the total amount of milk in the container is:

1000 ml + 2000 ml = 3000 ml

Total milk is distributed between 6 children.

Now, each of the children will get 3000 ml ÷ 6 = 500 ml

Hence, each of the children got 500 ml.

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