topic 5 - solids, liquids and gases

Question 1

how to calculate density

Answer 1

density = mass/volume

ρ = m/V

Question 2

practical: investigate density using direct measurements of mass and volume

Answer 2

• the density of an object can be found by measuring the mass and volume and applying the formula above to calculate the density.
• for a regular object use a ruler to measure the lengths needed to determine the volume.
• for an irregular object submerge it in water and measure the displaced volume.
• measure the mass of either type of object using a measuring balance.

Question 3

how to calculate pressure

Answer 3

pressure = force/area

P = F/A

Question 4

what is pressure is gases and still liquids like

Answer 4

Pressure in gases and liquids acts equally in all directions as long as the liquid is not moving.

Question 5

how to calculate pressure difference

Answer 5

pressure difference = height x density x gravitational field strength

P = h x ρ x g