Friday 27 April 2018

How can we prove gases exist?

This term in science, we are learning about states of matter. These are solid, liquid and gas, and each state of matter has its own properties. For example, you can pour liquids but not solids, glasses fill up all the space they can and solids don’t change shape unless they are forced.
Everything in our universe is made up of particles, and the way these are arranged in solids, liquids and gasses is different. Particles, or molecules, in a solid are closely packed together in a regular patter, those in liquids are more random and have space between them, and gases are totally random and have a lot of space between the particles.

Today, we set out to prove that gasses exist. We already knew that:

  • Things can be moved by gasses
  • Gasses are usually invisible
  • You can feel them, like the wind or breathe
  • We are alive because there is oxygen in the air around us
  • Sometimes you can smell gases, but this is usually a safety measure.
We carried out observations at five different stations.
 
  1. Shaking a bottle of fizzy drink. We noticed that lots of bubbles rush to the top and create a foam. Sometimes fizzy drinks go everywhere when you open them.
  2. Using syringes to move and feel gas. Nathan and Teddy noticed that if you fill the syringe with air, then cover the end with your hand, that you can’t push the air back out.
  3. Blowing bubbles into water. We all like blowing bubbles in our drinks, even though we’re not supposed to. The gasses in our breath are bubbling up through the water.
  4. Sponge immersed in water. We squeezed the sponge and saw the air escap from the spong and up the rough the water.
  5. Immersing a bottle under water. As the water rushes into the bottle, the air escapes and bubbles out.






We proved gasses exist!

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