Convection

Multiple Choice

Why is understanding density important in everyday life?

• Because it helps us understand why objects float or sink

• Because it determines the color of objects

• Because it affects the taste of food

• Because it changes the temperature of water

Hotspot

Which object has a greater density?

Multiple Choice

Which type of balloon demonstrates the lowest density?

• Water balloon

• Air balloon

• Helium balloon

• Rubber balloon

Multiple Choice

Which of the following is the correct formula for calculating density?

• Density = Mass × Volume

• Density = Mass ÷ Volume

• Density = Volume ÷ Mass

• Density = Mass + Volume

Math Response

What is the volume of a 100 gram block with a density of 2 g/cm 3?

Type answer here

Correct Answer: 50

Deg^°

Rad

Fill in the Blanks

Objects float if their density is

than water.

Multiple Select

Select all statements that correctly describe the behavior of air-filled and helium-filled balloons.

• Air-filled balloons rise because they are less dense than air.

• Helium-filled balloons rise because they are less dense than air.

• Air-filled balloons sink slowly because they are slightly denser than air.

• Helium atoms are heavier than nitrogen/oxygen atoms.

Multiple Choice

Which of the following statements best explains why saltwater sinks below freshwater in oceans?

• Saltwater is less dense than freshwater.

• Saltwater is more dense than freshwater.

• Saltwater and freshwater have the same density.

• Saltwater evaporates faster than freshwater.

Multiple Select

Which of the following are correct about convection?

• Heated fluid becomes less dense and rises.

• Cooled fluid becomes more dense and sinks.

• Convection only occurs in solids.

• Convection currents form a continuous cycle.

Fill in the Blanks

Density is calculated as mass

volume.

Multiple Choice

Which real-life application is directly related to differences in air density?

• Ocean currents

• Hot air balloons

• Weathering of rocks

• Photosynthesis

Fill in the Blanks

Density is calculated by dividing mass by

.