What is a density bottle?

Ram took an empty density bottle and a weighing machine. He measures the density bottle and a weighing machine. He measures the empty bottle and found it to be 40 .g. He then completely filled it with water and weighed it to be 100 g. With this data can he calculate the capacity of the density bottle? If so, what is its capacity

The mass of a density bottle when it is filled with a liquid of density 3000 kg m_(-3) is 400 g and the mass of the bottle when it is filled with water is 200 g. The mass of the empty density bottle is "__________" g.

The mass of a density bottle when it is filled with a liquid of density 3000 kg m^(-3) is 400 g and the mass of the bottle when it is filed with water is 200 g. The mass of the empty density bottle when it is filled with water is 200 g. The mass of the empty density bottle is "_____" g.

The mass of a density bottle is 25 g when empty, 50 g when filled completely with water and 365 g when filled completely with mercury. Find the density of mercury.

A density bottle weighs 100 g when filled with liquid annd 80 g when filled with water. If the weight of an empty density bottle is 20 g, find the density of the liquid.