# What is density in physics for kids?

Density refers to how much mass there is in a particular space. Imagine a drawer full of socks. It has a certain density. If you take a sock out, the density of the drawer changes. This is because the mass of the socks has changed, but the volume of the drawer has stayed the same.

## What is the simple definition of density?

1 : the quantity per unit volume, unit area, or unit length: as. a : the mass of a substance per unit volume. b : the distribution of a quantity (as mass, electricity, or energy) per unit usually of space.

## What is density and example?

Density is the measure of how much “stuff” is in a given amount of space. For example, a block of the heavier element lead (Pb) will be denser than the softer, lighter element gold (Au). A block of Styrofoam is less dense than a brick. It is defined as mass per unit volume.

## What is the unit of density?

The SI unit of kilogram per cubic metre (kg/m3) and the cgs unit of gram per cubic centimetre (g/cm3) are probably the most commonly used units for density. One g/cm3 is equal to 1000 kg/m3.

## What is density in a sentence?

Word forms: densities The region has a very high population density. In science, the density of a substance or object is the relation of its mass or weight to its volume. Jupiter’s moon Io, whose density is 3.5 grams per cubic centimeter, is all rock.

## Which of the following best defines density?

So, another way to define density is, it is the mass per unit volume of a substance. We can see this definition matches answer choice (D). The statement which best defines the density of a substance is (D): the mass per unit volume of a substance.

## How do you find density?

The formula for density is the mass of an object divided by its volume. In equation form, that’s d = m/v , where d is the density, m is the mass and v is the volume of the object. The standard units are kg/m³.

## What is density in liquid?

The density of a liquid is a measure of how heavy it is for the amount measured. If you weigh equal amounts or volumes of two different liquids, the liquid that weighs more is more dense.

## What are 5 examples of density?

• Oil and Water Don’t Mix. It’s a known fact that oil and water don’t mix, but what many people may not know is that the density of oil is what makes it float on top of water.
• Helium Balloons.
• Archimedes and Eureka!
• Icebergs.

## What is density of an object?

Density is the mass of an object divided by its volume. Density often has units of grams per cubic centimeter (g/cm3). Remember, grams is a mass and cubic centimeters is a volume (the same volume as 1 milliliter). A box with more particles in it will be more dense than the same box with fewer particles.

## What is the symbol of density?

ρ = density in g/cm 3. The symbol for density is the Greek letter rho, . m = mass in g.

## Who Discovered density?

Who discovered density? Density was discovered by a Greek mathematician and engineer named Archimedes. He was born in the city of Syracuse, which was the heart of art, commerce and science, and his father, Phidias, was a mathematician and an astronomer.

## What are types of density?

• Density, mass per unit volume.
• Area density or surface density, mass over a (two-dimensional) area.
• Linear density, mass over a (one-dimensional) line.
• Relative density or specific gravity, a measure of density in comparison to the density of something else.

## Why is density important?

Density is an important concept because it allows us to determine what substances will float and what substances will sink when placed in a liquid. Generally, substances float so long as their density is less than the density of the liquid they are placed in.

## Is density a weight?

The key difference between density and weight is that weight is a measure of the amount of matter in an object, whereas density measures the amount of matter in a unit volume. Density and weight are physical properties of matter. Both properties are related to mass.

## What’s the origin of density?

density (n.) c. 1600, “quality of being very close or compact,” from French densité (16c.), from Old French dempsité (13c.), from Latin densitas “thickness,” from densus “thick, dense” (see dense). In physics, “the mass of matter per unit of bulk,” 1660s.

## What kind of property is density?

Density is an intensive property because there is a narrow range of densities across the samples. No matter what the initial mass was, densities were essentially the same. Since intensive properties do not depend on the amount of material, the data indicate that density is an intensive property of matter.

## How is the mass of substance measure?

Mass is a measure of the amount of matter in a substance or an object. The basic SI unit for mass is the kilogram (kg), but smaller masses may be measured in grams (g). To measure mass, you would use a balance.

## How do you write the density of an object?

An object less dense than water will float on it; one with greater density will sink. The density equation is density equals mass per unit volume or D = M / V. The key to solving for density is to report the proper mass and volume units.

## How do you find mass with density?

Remember, you can arrange one formula to solve for mass, density, or volume. Here are the three equations to use: Mass = Density x Volume. Density = Mass ÷ Volume.

## Is milk denser than water?

We can observe the glass to sink showing milk is denser than water.

## Is ice heavier than water?

Having a lower density means that ice floats when placed in liquid water. When water freezes, it occupies more space than in its liquid form because its molecules expand. Therefore, if we have 1 liter of ice and 1 liter of water, the water will weigh more because it is denser.

## What’s heavier water or oil?

Explanation: Oil is lighter than water. It floats over water because its density is lower than that of water. The molecules that make up the oil are larger than those that that make up water, so they cannot pack as tightly together as the water molecules can.

## What is density in real life?

Density is the measurement of how tightly or loosely a given substance is packed into a given volume. Air, for example, is low density, much lower than human tissue, which is why we can pass through it.