Advertisements
Advertisements
Question
Define one kilogram, the S.I. unit of mass.
Advertisements
Solution
One kilogram (kg) is the S.I. unit of mass. It is defined as the mass of the international prototype of the kilogram, which is a platinum-iridium alloy cylinder stored at the International Bureau of Weights and Measures in France.
APPEARS IN
RELATED QUESTIONS
Just as precise measurements are necessary in science, it is equally important to be able to make rough estimates of quantities using rudimentary ideas and common observations. Think of ways by which you can estimate the following (where an estimate is difficult to obtain, try to get an upper bound on the quantity):
Name and define the S.I. unit of time. How is it related to (i) minute (ii) hour, (iii) day, and (iv) year?
Name the device commonly used to measure mass.
1 kg of rice is weighed by ______.
On the moon, the gravitational force is greater than on earth.
What is the standard unit of mass?
Write a short note on the following:
Spring balance:
Which of the following represents a unified atomic mass unit (1u)?
If Planck’s constant (h) and speed of light in vacuum (c) are taken as two fundamental quantities, which one of the following can, in addition, be taken to express length, mass and time in terms of the three chosen fundamental quantities?
- Mass of electron (me)
- Universal gravitational constant (G)
- Charge of electron (e)
- Mass of proton (mp)
Name the device used for measuring the mass of atoms and molecules.
