8.1: Internal Structure and Density

Big Idea

Density is an important property of matter for the study of fluid dynamics.

Define density.

Eureka: Volume & Density

Video: eureka 25 vol & density

Fluids can be characterized by their density. Density is defined as mass (m) per volume (V)

The density of a substance is its mass per unit volume. The symbol most often used for density is ρ although the Latin letter D can also be used.

Bozeman Science: Density

The volumetric mass density, of a substance is its mass per unit volume.

Specific gravity

Specific gravity (SG) is the density of the object divided by the density of the water.

Eureka: Volume & Density

This program explains that volume refers to the amount of space an object envelops and that density refers to the amount of mass that is compacted in a given volume.

Video: eureka 25 vol & density

Calculate the mass of a reservoir from its density.

EXAMPLE 11.1: Calculating the Mass of a Reservoir From Its Volume

A reservoir has a surface area of 50.0km^2 and an average depth of 40.0 m. What mass of water is held behind the dam?

Try this

Determine the mass of the air in the room if the density of air (atmospheric density) at sea level & standard temperature and pressure (15 °C and 101.3 kPa) is 1.225 kg/m3.

Compare and contrast the densities of various substances.

11.2 Density - College Physics for AP® Courses | OpenStaxWhich weighs more, a ton of feathers or a ton of bricks? This old riddle plays with the distinction between mass and density. A ton is a ton, of course;...

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