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# Density & Pressure

Yr 10 lesson Objectives
by

## Damian King

on 12 June 2013

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#### Transcript of Density & Pressure

One of the weights has a hole in the middle of it. How would you work out which it is? Describe how to determine density using direct measurements of mass and volume.
The density of water is:
1000kg/m^3 = 1g/cm^3 Density Measuring density Pressure Starter Recall and use the relationship between density, mass and volume Starter What makes something float or sink? Pressure with depth Ideal Gases Recall and use the relationship between pressure, force and area: STARTER
How does the bear prevent itself from falling though the ice? Density & Pressure What is the weight of air resting on your head? Why don't you feel the pressure? Understand that the pressure at a point in a gas or liquid which is at rest acts equally in all directions.

Recall and use the relationship for pressure

pressure = density × g × height Why are women advised not to wear high heels on expensive wooden floors? Unit of pressure: Pascals (Pa) Can you explain the following? Recall that molecules in a gas have a random motion and that they exert a force and hence a pressure when they collide with the walls of the container. Understand the significance of Brownian motion. Gas laws & Temperature Understand that an increase in temperature results in an increase in the speed of gas molecules. Describe the Kelvin scale of temperature and be able to convert between the Kelvin and Celsius scales.Units: kelvin (K), degrees Celsius (oC) Can you explain this effect Understand that the Kelvin temperature of the gas is proportional to the average kinetic energy of its molecules. Describe the qualitative relationship between pressure and Kelvin temperature Boyle's Law Use the relationship between the pressure and volume of a fixed mass of gas at constant temperature: Can you explain this effect Reverse process is a bomb Why is the balloon under-inflated?
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