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Shrinking balloons

Shrinking balloons. After 1 week. hydrogen. After 1 week. air. Shrinking balloons. The balloons have got smaller so some of the gas they contain has escaped. This means that the balloon must have holes in its surface. Since the gas is escaping it must be made of tiny particles.

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Shrinking balloons

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  1. Shrinking balloons After 1 week hydrogen After 1 week air

  2. Shrinking balloons • The balloons have got smaller so some of the gas they contain has escaped. • This means that the balloon must have holes in its surface. • Since the gas is escaping it must be made of tiny particles. • To escape these particles must be able to move.

  3. Mixing substances • Diffusion is the name for the way in which one substance can spread through another.

  4. Diffusion Gas and gas Cover slip After 10 minutes Brown gas

  5. Diffusion Liquid and liquid After water 2 days Blue liquid

  6. Diffusion Solid and liquid After water 5 days Blue crystal

  7. Diffusion Solid and jelly After jelly 1 week Blue crystal

  8. Liquid Solid Gas Solid, Liquid and Gas

  9. Diffusion Gases • These experiments tell us: Larger spaces between particles Liquids Solids

  10. Diffusion Particles move quickly Particles move slowly Particles hardly move Gases • These experiments tell us: Liquids Solids

  11. Expansion and Contraction • When anything is heated it expands (gets bigger), and when it is cooled it contracts (gets smaller). • Phone wires are hung loosely, so that they will not break when they contract in winter.

  12. Expansion and Contraction • Railway lines have gaps between them, so that they will not buckle and bend in hot weather. • The mercury in a thermometer expands and contracts so that we can measure temperature.

  13. Heat the bimetallic strip The bimetallic strip

  14. The bimetallic strip bends

  15. The bimetallic strip is made of two different metals. • When the bimetallic strip is heated both metals expand differently. • This makes the bimetallic strip bend. • The bimetallic strip is used in fire alarms and thermostats.

  16. Solid compressed Compression

  17. Liquid compressed

  18. Gas compressed

  19. Air pressure • Air particles move quickly around us. • They hit us, and all other objects, from all sides. • This force on us is called air pressure.

  20. condensation liquid evaporation gas liquid solid melting freezing steam (gas) water (liquid) water (liquid) ice (solid) The water cycle.

  21. Density • In dense materials the particles are packed closely together. • Density is measured by dividing mass by volume. • Water has a density of 1 g/cm3. • Any substance with a density of more than 1 g/cm3 will sink in water.

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