Density

Question 1

What is density?

Answer 1

Density is a measure of HOW MUCH MASS there is in a CERTAIN SPACE.

Question 2

How can you work out density?( formula )

Answer 2

Density (kg/m3) = mass (kg) ÷ volume (m3)

P = m ÷v

Question 3

What is denser than liquids?

Answer 3

Solids

Question 4

What is denser than gases?

Answer 4

Liquids

Question 5

Example: A 0.0020 m3 block of aluminium has a mass of 5.4 kg

Calculate the density of aluminium

Answer 5

Density = mass ÷ volume
= 5.4 ÷ 0.0020
= 2700 kg/m3

Question 6

What is the volume of a cuboid?

Answer 6

Length × width × height

Question 7

How to find density of an irregularly-shaped object

Step one

Answer 7

Use A BALANCE to measure it’s MASS

Question 8

Step two

Answer 8

FILL a DISPLACEMENT CAN (a can with a SPOUT in its side) with WATER so the water level is ABOVE the spout.

Question 9

Step 3

Answer 9

Let the water drain from the spout, leaving the water level JUST BELOW the start of the spout.

Question 10

Step 4

Answer 10

Place a MEASURUNG CYLINDER under the spout

Question 11

Step 5

Answer 11

Place your object INTO THE WATER.

This will PUSH some of the water OUT through the spout.

Question 12

Step 6

Answer 12

MEASURE THE VOLUME of water that has collected in the measuring cylinder.

Question 13

Step 7

Answer 13

This is EQUAL TO the VOLUME of the OBJECT

Question 14

Step 8

Answer 14

Use the FORMULA above to find the objects DENSITY

Question 15

To find the density of a liquid

Step 1 (liquid)

Answer 15

Place a MEASURING CYLINDER on a balance and ZERO the balance

Question 16

Step 2 (liquid)

Answer 16

Pour 50 ML of the liquid into the measuring cylinder

Question 17

Step 3 (liquid)

Answer 17

Record the liquid’s MASS shown on the mass balance

Question 18

Step 4 (liquid)

Answer 18

Use the FORMULA to find the DENSITY. The VOLUME is 50 CM3, or 0.00005 M3.

Question 19

What di you need to remember when finding the density of a liquid and the density of an irregularly-shaped object

Answer 19

1 ml = 1cm3 and that

1 cm3 = 0.000001 m3.