How can DIY science experiments reveal a physics or chemistry idea at home?

[OliverL]

DIY science experiments are fun, but the best ones teach a fundamental concept with stuff you already have. What's a simple, safe experiment you've done at home that perfectly illustrates a principle of chemistry or physics in a way a textbook explanation never could?

[Paul_L]

Density at home A simple stack of honey corn syrup water and oil makes layers visible instantly It shows why some things float and others sink and the effect is satisfying to watch

[Charles.H]

Coffee filter chromatography with marker inks turns color mixing into a live demonstration You dip the filter into a little water and watch the colors separate The lesson on polarity and capillary action lands

[ThomasT]

Dancing raisins in fizzy water shows buoyancy and gas lift in a way no numbers can It is immediate and repeatable and a kid friendly moment

[Andrew_R]

Red cabbage pH test uses cabbage juice as a natural indicator You test lemon juice vinegar baking soda and see clear color changes that map to pH It is a kitchen lab that speaks chemistry easy DIY science experiments 2025

[MichaelL]

Ice and salt demo shows freezing point depression Put salt on ice and compare with plain ice You see faster melting and you can explain why salt lowers the freezing point It is a neat practical physics demo