Science Week – What happens to things in a vacuum?

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We were lucky enough today to have one of our parents demonstrate to the children how things change in a vacuum.  We saw a balloon blown up by putting it in a vacuum and then had great fun watching what happened to marshmallows.  As the marshmallows were placed under vacuum they expanded; they got really big – once the vacuum was removed then they shrank and went really wrinkly.  Finally we saw what happened to water under vacuum which was amazing – when the vacuum was applied the water boiled and then as the vacuum was released we watched as boiling water turned instantly to ice!!  It was definitely a great way to start our Science Week activities