what is density bottle ? how can you measure the relative density of a substance using the density bottle.​

A density bottle is a scientific instrument used to determine the density of a liquid. It is a sealed flask with a stopper that has a capillary tube through it, which allows for the expansion and contraction of the liquid inside. The bottle is usually made of glass and has a specific, known volume.

Here are the steps to measure the relative density of a substance using a density bottle:

1. Clean the density bottle thoroughly and dry it. Weigh the empty bottle with its stopper and record this weight (W1).

2. Fill the bottle with the liquid whose density is to be determined. Make sure the liquid is at room temperature. Insert the stopper carefully to avoid any liquid being forced out. Wipe off any liquid on the outside of the bottle. Weigh the bottle and its contents and record this weight (W2).

3. Empty the bottle and rinse it with distilled water. Fill it with distilled water at the same temperature as before. Insert the stopper and wipe off any water on the outside of the bottle. Weigh the bottle and its contents and record this weight (W3).

4. The relative density of the liquid can be calculated using the formula:

   Relative Density = (W2 - W1) / (W3 - W1)

Where:

• W1 is the weight of the empty bottle
• W2 is the weight of the bottle filled with the liquid
• W3 is the weight of the bottle filled with distilled water

This method is based on the principle that the weight of a body in air is equal to the weight of the equal volume of water displaced by it.