Density Basics
What is the formula for density?
Mass ÷ Volume
What tool is used to measure mass?
Balance or scale
What is the formula to find the volume of a box
Length × Width × Height
What is the formula to solve for mass
Mass=Density x Volume
Why does ice float in water?
Ice is less dense than liquid water.
What unit is density usually measured in?
g/cm³ or g/mL
What are the metric units for mass?
Grams (g) or kilograms (kg)
What units are used for solid volume?
cm³ (cubic centimeters)
What is the formula for Volume
Volume = Mass/Density
Why do helium balloons float in air?
Helium is less dense than air.
An object has a density of 0.8 g/mL. Will it float or sink in water?
Float (because water’s density is 1 g/mL)
True or False: The mass of an object changes on the Moon.
False (weight changes, mass does not).
What tool is used to measure the volume of a liquid?
Graduated cylinder
If a block has a mass of 200 g and a volume of 50 cm³, what is its density?
4 g/cm³
Why does saltwater make it easier to float than freshwater?
Saltwater is denser.
If two objects have the same volume but different masses, which one is denser?
The one with the larger mass.
If density = 2 g/cm³ and volume = 5 cm³, what is the mass?
10g
A box is 2 cm × 3 cm × 4 cm. What is its volume?
24 cm³
An object has a density of 5 g/cm³ and a mass of 25 g. What is its volume?
5 cm³
Why do some rocks float in water (like pumice)?
They have air pockets, lowering their density.
A wood block floats halfway in water. What is its density?
About 0.5 g/mL.
How is mass different from weight?
Mass is the amount of matter; weight is the pull of gravity on that matter.
If a rock displaces 10 mL of water, what is its volume?
10 mL (or 10 cm³)
A cube has a volume of 8 cm³ and a density of 2 g/cm³. What is its mass?
16g
Submarines rise and sink by controlling what?
Their density (changing amount of water in ballast tanks).