How do you make a Geyser at home for kids?

To create a simple geyser experiment at home with kids, mix baking soda and vinegar in a plastic bottle or container. Start by adding a few tablespoons of baking soda, then pour in vinegar and quickly seal the bottle with a cap or cover it with a balloon. The reaction between baking soda and vinegar produces carbon dioxide gas, creating pressure that will eventually cause the mixture to erupt like a geyser. Make sure to do this outside or in a space that's easy to clean!