During performing practical in the physics laboratory, the measurement of any object is repeated several times, and then the average value is obtained.
Measuring Length
Measurement of any quantity involves two things: the size of the value and unit of measurement.
The metric system is the most convenient system to make measurement almost all over the world.
Mechanical Method of Measuring Distance
- Measurement of any quantity involves two things: the size of the value and unit of measurement.
Measuring Length By Ruler - A metre (meterstick) and a half metre rule are also used in the laboratories for experimental work.
- Very long distances (e.g. length and width of a plot of land or a school area) are measured in a larger unit by using a long measuring tape. It is also used to measure the length of curved surfaces.
Measuring Tape
Precautions
- While measuring the length of an object, keep your eye perpendicular to the ruler above the mark to be read to avoid parallax error.
Precautions - For accuracy, a measurement is repeated several times to take the average value.
Smaller Unit of Length
The SI unit of length is a metre which is denoted by letter m. The smaller units of length and their conversions are giving in the following table.
