Tuesday, 22 November 2011

Valume Of Liquid

     Water is a form of liquid. It is an important natural source and a basic need in our lives. We use water for drinking and cooking. Factories producing drinks use water to prepare drinks. How is the amount of water measured?
     Long ago, people used imperial units for volume of liquid,  volume of liquid. Two pints are equivalent to a quart, and unit for volume of liquid. Unit such as barrels and hogsheads were used for larger volumes of liquid.
     The instruments used today, such as pipettes, burettes, and measuring cylinders measure the volume of liquid more accurately. The standard  units of measurements for volumes in the Metric System are millilitres for smalller volumes and litres for larger volumes. The symbol"ml" and "l" are used respectively. The symbol "L" can also be used for litres.    
     Petrol and diesel are measured in litres. The amount of maney that we pay for petrol is based on the volume and mineral water are available in different volumes. The small-sized bottles are labelled with millilitres (ml), and larger-sized bottles are labelled with litres (l). Household items such as shampoo, perfume and liquid detergent are also labelled with these units.
   In our daily activities, we might use a certain fraction of the total volume of liquid. For example, we may use 1/4 of  a bottle of 1 litre orange cordial to prepare a jug of orange-flavoured drink. We can determine this volume in millilitres using mathematical operations. This is the skill that is emphasised in the topic of Volume of Liquid to compute the volume of liquid from situation expressed in fraction. Pupils will also learn to solve real life problems involving volume of liquid using Polya's model.

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