The amount of matter contained in an object is the measure of its 

S.I unit of mass is 

S.I unit of weight is 

S.I unit of time is

1 quintal = 

C.G.S unit of mass is 

1 kilogram (kg) = 

The force with which earth attracts the body towards its centre is 

Units of weight is often expressed as 

The device used to measure the time interval is