Metal is the best conductor of heat because its atoms are arranged in a way that allows electrons to travel freely, meaning they can pass energy more quickly.

Temperature is the mode by which we express hot and cold. We most commonly do so using measurements in either Fahrenheit or Celsius. Temperature is a manifestation of thermal energy and can be measured using a thermometer.

Insulators are materials that do not allow heat to escape or be conducted away. Examples of insulators are down clothing, fiberglass, or plastic.

Insulators are materials that do not allow heat to escape or be conducted away. Because the arctic fox lives in a harsh, cold environment, its fur is there to help keep it warm. Most animals that live in frigid environments have a layer of fur to act as an insulator.

Metal is a good conductor of heat because energy passes through it quickly. When a pan is put on a hot stove, the particles closest to the burner begin to move more rapidly. They bump into the slower-moving particles, which causes the heat to spread. In this photo, the metal pan is acting as a conductor to spread the heat coming from the burner.

Light travels in a straight line at an incredible speed of 186,000 miles per second. Light can be affected when it hits an object. Light travels as a wave. It does not need any matter or material to carry its energy along. Light exhibits characteristics of both waves and particles called photons.

Light travels in straight lines as a wave through the air. There is a small portion of the electromagnetic spectrum, which is comprised of visible light that we can see. Televisions, oven display screens, and cell phones all transfer energy through light. They use electricity or chemical energy that is transferred to light energy to generate visible light.

When most people think about light, they think about how electrical currents or chemical energy are used to generate light. Light can make power for people to use in their houses every day. Many people are using solar panels to power their homes, heat their pools, and lower their dependence on electric companies and fossil fuels. Using the Sun's free rays, which do not cause pollution, and are easy to capture, is a great way to generate power for a single home or a whole town.

The leading technology used in home remote controls is infrared (IR) light, which is invisible to the human eye. X-rays are used to take pictures inside the body of bones when looking for breaks or injuries. Ultraviolet light is the type of rays that the Sun puts off, and they can be harmful to your skin and eyes if left unprotected. Visible light is what the human eye can see on the electromagnetic spectrum.

Light is made up of waves of electromagnetic energy. It is the visible portion of the electromagnetic spectrum or electromagnetic waves that we can see. Visible light is only a tiny part of the electromagnetic spectrum. Light energy is the only form of energy we can see. Light from the sun helps plants grow and makes food for us to enjoy.