# IGCSE PHYSICS: chapter 19- density and pressure

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- Created by: becky parsons
- Created on: 27-04-13 10:31

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- Chapter 19: density and pressure
- density, ? = mass, m / volume, V
- Density is measured in kg/m³.
- To convert from kg/m³ to g/cm³ times by 1000.

- volume = w (width) x h (height) x d (depth)
- pressure, p = force, F / area, A
- Pressure is measured in Pa = pascals
- It is the weight in newtons per metre squared acting down on a surface.
- 1 Pa = 1 N/m²

- Pressure is measured in Pa = pascals
- In stationary liquids and gases the pressure increases with the depth of a gas or liquid.
- Pressure difference, p, in Pa = height in m x density in kg/m³ x gravitational field strength in N/Kg
- To find the density of an irregular shaped object.
- 1. Weigh the density of the object.
- 2. To find its volume, fill a can with a pout with water until it just flows out of the spout.
- 3. Place a clean, dry measuring cylinder beneath the spout.
- 4. Slowly lower the irregularly shaped object into the can until it is completely submerged.
- 5. The water displaced will have the same volume of that of the object.
- So the volume of the object is found by measuring the volume of the water collected in the measuring cylinder.

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