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Density Unit 2.4

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11.What is density?A measure of the mass per unit
volume of a substance.
22. What does density measure?Density measures how much
matter is packed into a space.
33. Which is more denser stones or feathers?Stones are more denser than feathers because they have more mass.
44. Which is more denser between liquids and solids of the same material and why?Solids are more dense because they
have closely packed particles.
55. What does density depend on?Density depends on the
amount of volume.
66. What happens to the density of solids and liquids when they're heated?The substance takes up more space
and so it's density increases.
77. What happens to gases when they are heated?When a gas is heated, its particles spread out even further, lowering its density
even more.
88. Why does smoke rise?Smoke rises because the air is hot and it
carries soot and burnt material
with it.
99. Why does a hot air balloon rise?The overall density of the hot air balloon is less than the density of the air around it, allowing it to rise into the sky.
1010. What is mass?Mass measures how much matter is in a substance and is sometimes its weight.
1111. What is density measured in?Density is measured in grams per
centimeter cubed : 1 g/cm 3
1212. What units are used to measure mass?Grams (g), kilograms(kg) and tonnes (t)
1313. What does mass depend on?Mass depends on the amount of
of space a substance takes up.
1414. What is volume?Volume is the amount of space that a substance takes up
1515. What is mass measured in?Mass is measured using a beam balance, electronic balance or scales.
1616. What is volume measured in ?It is measured in milliliters(ml)
and liters (L)
1717. What happens when a substance is placed in water?If it is very dense it will sink to the
bottom and if it's not very dense
it'll float.
1818. How does water act above 4 degrees Celsius?It starts to expand
because it's heated.
1919. How does ice act below 0 degrees Celsius?It starts to contract
because it has been cooled.
2020. How does water act between 0 and 4 degrees Celsius?It begins to expand when it gets heated
and starts to contract when it is cooled.