SOLIDS, LIQUIDS AND GASES = (5)

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10 Terms

1
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DENSITY AND PRESSURE

What is density

  • is mass per unit volume

2
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DENSITY AND PRESSURE

Formula linking:

  • density

  • mass

  • volume

density = mass / volume

3
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DENSITY AND PRESSURE

Find the density from an object

  1. to measure the density of a substance, use a mass balance to measure its mass

  2. if it is a box shape start by measuring its length, width and height with an appropriate piece of equipment. then calculate its volume by multiplying the length, width and height together

  3. for a irregular solid, you can find its volume by sybmurging it in a eureka can filled with water. The water displaced by the object will be transferred to the measuring cylinder

  4. record the volume of water in the measuring cylinder. this is also they volume of the object

  5. plug the objects mass and volume into the formula to find the density

4
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DENSITY AND PRESSURE

what is pressure

  • the measure of the force being applies to the surface of something

  • measured in pascals

  • same force over a larger area creates lower pressure

  • in gasses and liquids, the pressure at any point acts equally in all directions

  • in gasses and liquids the pressure increases with depth

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DENSITY AND PRESSURE

formula for pressure

pressure = force / area

6
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DENSITY AND PRESSURE

what is pressure difference

  • the difference in pressure between 2 points in a liquid or gas

  • it depends on the height difference and the density and gravity

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DENSITY AND PRESSURE

formula for pressure difference

pressure difference = height x density x gravitational field strength

8
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TEMPERATURE AND PARTICLE THEORY

What is absolute zero

  • -273*

  • at this temperature particles have as little energy in their kinetic stores as possible

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TEMPERATURE AND PARTICLE THEORY

energy in particle’s kinetic energy store is proportional to temperature

  • particle theory says that gasses consist of very small partilce’s which are constantly moving in random directions

  • if you increase the temperature it gives the particles more kinetic energy

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PARTICLE THEORY AND PRESSURE IN GASES