density

1. is

1.1. weight per volume of an object or substance

1.2. affected by

1.2.1. the number of

1.2.1.1. collisions

1.2.1.1.1. between particles in

2. can be changed by

2.1. changing outside

2.1.1. pressure

2.1.1.1. in a gas

2.2. dissolving

2.2.1. something into another substance make a

2.2.1.1. mixture

3. affects

3.1. wheter or not something will be

3.1.1. floating

3.1.1.1. when put in a fluid.