Density and Relative Density

The video tutorial explains how lava lamps work by introducing the concept of density, which is the ratio of mass to volume. It discusses the unique behavior of water's density, known as anomalous expansion, and how it affects the floating of ice. The tutorial further explains relative density, a comparison of a substance's density to water's density, and how it is calculated. Archimedes' principle is introduced as a method to determine the density of solids and liquids by measuring the loss of weight when immersed in water. The video concludes with a summary of the key points discussed.

What is the unit of density?

• Pound per square inch

• Gram per liter

• Kilogram per cubic meter

• Newton per meter

Why does ice float on water?

• Ice is more transparent than water

• Ice has a lower density than water

• Ice has a higher temperature than water

• Ice is heavier than water

What is the relative density of wood if its density is 0.8 into 10^3 kg/m^3?

• 0.5

• 1.2

• 1.0

• 0.8

According to Archimedes' principle, what is the upthrust on a body immersed in water equal to?

• The density of the body

• The weight of the displaced water

• The volume of the body

• The weight of the body in air

How do you find the density of a solid using Archimedes' principle?

• Measure its color

• Measure its temperature

• Measure its weight in air and in water

• Measure its volume in air

What must be true about an object used to find the relative density of a liquid?

• It must be transparent

• It must sink in both the liquid and water

• It must float in both the liquid and water

• It must be a cube

How is the relative density of a liquid determined using Archimedes' principle?

• By measuring the color of the liquid

• By comparing the loss of weight of an object in the liquid and in water

• By calculating the volume of the liquid

• By measuring the temperature of the liquid