Learn with Rashmi Class-7

 We should take the following precaution in order to measure the length of an object correctly. 1. Error due to wrong site angle. The eye should be placed vertically above the end where the reading is to be taken. 2. Error on the position of scale.  The ends off the ruler must not be worn out.In case the ruler is still in  use,any other fullmark on the ruler should be used. As shown in the given figure.                            

- Length is the measurement of the distance between any two points.SI unit of length is meter (m). The devices are: - Ruler - Measuring tape - Inch tape - meter rod

  The unit of measurement which is accepted internationally are called the standard unit SI Units. The 7 fundamental unit are:

  The comparison of an unknown physical quantity with a known standard quantity of same kind is called measurement.