Explain the need for accurate measurements and the device to be use for that.
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NEED FOR ACCURATE MEASUREMENT:
In ancient times people use the foot, the footstep, the handspan or the arm to measure length. But these units of measurement were unreliable because they vary from person to person. Measurement is required for a variety of things in our daily life. If you want to get a dress stitched then you need to know the length of the cloth that would be required to make it. Similarly when you have fever you measure the temperature of your body by a thermometer. To make a cake the ingredients have to be used in the right proportion.All these measurements must be made accurately using the standard units. There was a need for units of measurement which could be uniformly used by everyone units are called standard units.
In our daily life we use various types of measuring devices. the type of device to be used depends on the type of work and accuracy that is needed. The most common instruments used are the METER SCALE AND THE MEASURING TAPE.