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What keeps bubbles and other things, like airplanes, floating or flying in the air?

In this activity learners will explore the concepts of density and matter in their quest to answer one simple question-will it sink or will it float?

In this physics activity (page 12 of the PDF), learners explore potential and kinetic energy by rolling different sized marbles down an inclined plane.

In this sensory activity, young learners explore chemical reactions by making their own play dough from home.

Learners investigate the properties of the liquids in two bottles. One contains layers of oil and water, and one contains oil, water, and soap.

Experiment with liquids of different densities and create liquid layers. For example, oil and water have different densities: oil floats on water because it is less dense than water.

In this "Sid the Science Kid" activity from Episode 109: The Perfect Pancake, learners make applesauce to explore irreversible change.

In this activity, learners will discover how to make butter from scratch. One optional tips includes adding marbles to speed up the process.

In this activity, learners will explore light with reflective surfaces. Learners will make predictions and share their observations as they experiment with directing a beam of light.

In this activity, learners create a kind of balance device using a wire coat hanger, some string, and paper cups.

How do you measure a bubble when it's floating? You can't really, but in this activity, learners can measure the diameter of the ring of suds a bubble leaves on a flat surface.

In this water activity, learners test which objects float and which sink. Learners discover that objects behave differently in water.

In this activity, learners make film canister rocket ships. A fin pattern is glued onto the outside of the canister, and fuel (water and half an antacid tablet) is mixed inside the canister.

In this activity, learners engineer a paper helicopter that spins to the ground when dropped.

In this water activity, learners explore how water drops behave on different surfaces.

In this outdoor water activity, learners explore how to change the direction of water flow. Learners make puddles in dirt or use existing puddles and sticks to make water flow.

In this activity, learners will create their own percussion instrument with recycled materials. Learners will explore design, fabrication, cause and effect and sound through this activity.

In this activity, learners will dip different items in paint and then roll those items down a ramp. Learners will use science process skills such as observations and experimenting.

Did you know that using a lens one can bend light to make pictures of the world? It's true!

This is written as a display, but can easily be adapted to a hands-on activity. Learners observe and shake containers of shiny liquids.