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Something a bit different for our science this afternoon, in that in the style of true scientists I'm going to leave the investigating up to you. What we have is some sentences about states of matter. What you need to do is find out whether these are true or false using whichever method you choose, as long as you can prove your answer is correct! Send me your reasons, explanations and/or experiments in email. You don't have to do them all, pick 3 or 4 of the ones you think you can prove. Without any further delay, here's what I want to know, true or false?


  • All solids are hard.
  • All liquids can be changed into a solid in a household freezer.
  • All liquids take the shape of the container they are in.
  • Some liquids are sticky.
  • Liquids and some solids can be poured.
  • A liquid evaporates into a gas.
  • All gases are invisible.
  • A solid melts into a liquid.
  • When water freezes it can't be turned back into a liquid.
  • Hot water turns into ice faster than cold water.
  • All states of matter take up space.
  • Solids change their shape to match their container.
  • Only non-living things have a state of matter.
  • Salt is a liquid.
  • All liquids flow at the same speed.
  • It's impossible to turn a gas back into a liquid.
  • The human body contains solids, liquids and gases.