Energy

Introduction

Energy is the fundamental force that drives change and motion throughout the universe. Follow the light to begin exploring its many forms and transformations.

Particles

The state of matter is determined by the kinetic energy of its particles. Add energy with the slider to see how solids, liquids, and gases behave at a microscopic level.

State Change

Adding energy can cause a substance to change its physical state, breaking the bonds that hold it together. Press and hold to apply heat and watch this crystal transform from a solid to a liquid and then to a gas.

Living Things

Living organisms capture, store, and use energy to grow and survive. Click the sun to gather light energy, then use that stored energy to help the plant grow.

Reactions

Chemical reactions involve the breaking and forming of bonds, often releasing or consuming energy in the process. Drag the reactants together to see an exothermic reaction unfold.

Seasons

The tilt of the Earth's axis determines how directly sunlight hits each hemisphere as it orbits the sun, creating the seasons. Use the slider to change the earth's orbital position and observe how it affects the distribution of energy.