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infrared
Definition
Infrared light is a type of light that we can't see, but that we can feel as heat. It is all around us, coming from the sun, from warm objects, and even from our own bodies.
Infrared light has a longer wavelength than visible light, which is why we can't see it. But we can feel it as heat because infrared light can vibrate the molecules in our skin.
Infrared light is used in many different ways, such as in remote controls, night vision goggles, and heat sensors.
How can the word be used?
The sun emits infrared radiation.
Different forms of the word
Noun: Infrared is a type of electromagnetic radiation that has wavelengths longer than visible light but shorter than microwaves. It is invisible to the human eye, but it can be detected by special cameras and sensors.
Adjective: Infrared means relating to or using infrared radiation. For example, an infrared camera is a camera that uses infrared radiation to see in the dark.
Etymology
The word "infrared" is a combination of the words "infra" and "red".
Infra means "below" or "under".
Red refers to the color of visible light that has the longest wavelength.
So, the word "infrared" literally means "below red". This is a very accurate description of the meaning of the word, as infrared radiation has wavelengths that are longer than visible red light.
Question
What is infrared?