Two objects have equal mass but one has twice the volume. Its density is:

1. Density is fixed by mass and volume together. 2. Density is the mass per unit volume of a substance or object. 3. With mass held constant, density falls as volume rises. 4. Doubling the volume therefore halves the density. 5. The less dense object is the one more likely to float. _Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 11 'Fluid Statics', sections 11.1-11.9_