What’s a concentration gradient?
How come a hot drink gets cold if you leave it out? I can’t drink my hot chocolate fast enough!
Why does food cool off while drinks get warmer?
What is insulation? What does it do?
Why do balloons lose their air after a long time? Every time that I leave a balloon out overnight, it is always smaller the next day!
What is osmosis?
What is a state of equilibrium?
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