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# density

what is density Density is the mass of 1cm³ of a substance
how do you find the density of an object to find the density of an object you have to divide the mass by the volume
what is the standard unit for density the standard unit (SI) for density is kg/m cubed
what unit is commonly used for density g/cm cubed
Can the density of an object change? yes
Changing the density of an object The density of an object can change if either the mass or volume of the object is changed When liquids and gases are heated their volumes change and their densities change as a result
How does density change when we heat/cool liquids or gases? When volume increases, density decreases. When volume decreases, density increases.
Why is density important? Flotation, A knowledge of density can help us predict whether something sinks or floats This is useful for choosing materials for designing items that need to float e.g. life jackets
Why is density important? substance Substance identification A knowledge of density can help us predict what the substance is e.g. geologists use density to identify rock types
why is density important? engineering Engineering A knowledge of density can help us design different objects Some goods are designed to make them easier to carry e.g. MacBook Air and suitcases Energy efficient cars use low density materials to keep them light, saving fuel
How does an iron ship float? How does an iron ship float when iron(7.874 g/cm³) is denser than water (1g/cm³)? An iron ship floats because the average density of the ship is less than water Inside the iron sides of a ship is a large pocket of air pocket which helps flaot
how does an iron ship float? the iron is spread out so the average density of the iron is less than the density of water
Created by: JMahango
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