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aerobic	able to work the heart and lungs to help the body use oxygen better.
aerobics	(used with a singular or plural verb) a form of exercise that works the heart and lungs to help the body use oxygen better. Running, swimming, biking, or dance are forms of aerobics.
air	the mixture of gases that surrounds the earth. Air is made up of oxygen, nitrogen, and other gases, and has no taste, odor, or color. [1/6 definitions]
atom	Atoms are very tiny things in the universe. We cannot see them with our eyes, but they make up everything around us and in space. Chemical elements, which are the building blocks of all substances, are made up of atoms. Some chemical elements that you may know are gold, copper, helium, oxygen, mercury, and lead. Each of these elements is made up of a different kind of atom.
blood	the red liquid containing oxygen and nutrients that pumps through the veins and arteries of humans and many other animals. [1/2 definitions]
carbohydrate	a compound made of carbon, hydrogen, and oxygen. It is formed mainly by plants, and it is used in the body to easily produce and store energy. Sugars and starches are carbohydrates. [2 definitions]
carbon	Carbon is one of the chemical elements found on Earth, and it is a very common element on this planet. It is also found all over the universe. Carbon atoms often combine with atoms of other elements, such as oxygen and hydrogen. Diamonds are an example of something made only of carbon atoms. [1/2 definitions]
carbon dioxide	a gas without color or odor that is made up of carbon and oxygen. Carbon dioxide is in the air and is used in soft drinks. Frozen carbon dioxide is called dry ice.
charcoal	the solid, black form of carbon made by burning wood or other matter in a space with very little oxygen. [1/2 definitions]
chemical	Chemicals are the different substances that exist on the earth and in space. A chemical can be one basic substance, such as oxygen or gold or iron, but we also use the word chemical when we talk about mixtures of things, such as gasoline. People often think of chemicals as liquids, but chemicals can be solids and gases too. Chemicals are things that we can find in nature, but chemicals can also be substances that scientists make for special purposes, such as for medicines or products that we use in our daily lives. [1/2 definitions]
chemistry	Chemistry is one of the sciences. In chemistry, people study the basic substances that all things are made of. Iron, oxygen, and gold are some examples of basic substances. In chemistry, people also study what happens when they put basic substances together.
dioxide	a compound containing two atoms of oxygen bound to a single atom of another element.
draft	a device that controls the flow of air in a stove or furnace. Fires need the oxygen in air in order to burn. [1/10 definitions]
element	any of the 118 substances that cannot be separated into simpler substances by using chemistry. Lead, gold, and oxygen are examples of elements. [1/4 definitions]
fat	a white or yellow oily substance found in some parts of animals or plants. Fat is made of carbon, hydrogen, and oxygen. [1/4 definitions]
hydrogen	a very light gas that burns easily and is one of the chemical elements. Hydrogen is the most abundant element in the universe. It combines with oxygen to make water, and it is found in all living things. Hydrogen combines with many substances and has many uses. (symbol: H)
incubator	a warm container that protects and helps babies that are sick or born too early. An incubator allows doctors to control the temperature, amount of oxygen, and other conditions that affect a baby's health. [1/2 definitions]
lung	one of two organs in the chest that are used in breathing. Lungs are found in mammals, birds, reptiles, and some other animals. They bring oxygen to the body and get rid of carbon dioxide.
mask	a covering for the mouth and nose to protect the wearer from germs, poisonous gases, dust, or the like. A mask is also used to protect other people from one's own germs. Some kinds of masks are used to provide oxygen or other breathable gas to the wearer through an attached tube. [1/6 definitions]
molecule	A molecule is something made up of a single atom or a group of atoms. Atoms are tiny invisible things that make up everything in the world, and there are many different kinds of atoms. A molecule can have just one type of atom, or it can have atoms of different types. Water, for example, is a substance whose molecules are made up of two different types of atoms. One molecule of water contains two atoms of an element called hydrogen and one atom of an element called oxygen. This is the smallest amount of water that is possible, because, if you take away any one of these atoms, the molecule is not water anymore. If you change one of the atoms to something different or add more atoms, you don't have water anymore. If you want to create more water than this one molecule, you have to add at least one more molecule with exactly the right atoms. All water is made up of these same molecules.
O²	symbol of the chemical element oxygen.

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