| laser |
a device that makes a strong, narrow beam of light by stimulating the atoms in a gas or crystal. |
| leaky |
letting gas, water, or odors escape. |
| liquid |
in a form that flows easily and is neither a solid nor a gas. [2 definitions] |
| main |
a large pipe for distributing water or gas to homes or other buildings. [1/2 definitions] |
| 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] |
| methane |
a gas made of carbon and hydrogen atoms that is stored in and collected from the earth. Methane is used for heating and cooking in the form of natural gas. |
| motor scooter |
a light, two-wheeled, gas-powered vehicle with two small wheels and a seat over the engine for the driver. |
| natural gas |
a mixture of gases found in the earth's crust. Natural gas is burned as cooking and heating fuel. |
| nebula |
a cloud of dust or gas found between the stars. A nebula may seem either bright or dark, depending on how it reacts with light. |
| neon |
a gas that is one of the chemical elements. Neon is used in making electric signs, because it glows orange when an electric current passes through it. (symbol: Ne) [1/2 definitions] |
| nitrogen |
a gas with no color or smell that is one of the chemical elements. Nitrogen makes up about eighty percent of the earth's atmosphere, and it is also found in all living things. (symbol: N) |
| nozzle |
a narrow spout fitted to the end of a hose or pipe. A nozzle is used to control the flow or spray of a liquid or gas. |
| oxygen |
a gas with no color or smell that is one of the chemical elements. Oxygen combines with hydrogen to make water. It also makes up about twenty percent of the earth's atmosphere. Most living things need oxygen. (symbol: O) |
| pipe1 |
a tube of metal, plastic, or other material, through which a gas or liquid may flow. [1/6 definitions] |
| pipeline |
a long line of pipes for moving gas or oil from where it is produced to where it is used or sold. |
| pump1 |
a machine for moving a liquid or gas from one place to another. [2/6 definitions] |
| radon |
a radioactive gas that is one of the chemical elements. It is found in small amounts in some soils and rocks. (symbol: Rn) |
| smoke |
to give off smoke or a vapor or gas that looks like smoke. [1/6 definitions] |
| solid |
having a firm shape or form that can be measured in length, width, and height; not like a liquid or a gas. [2/8 definitions] |
| sparkle |
to give off gas bubbles; bubble. [1/4 definitions] |
| tank |
a large container used to hold liquid or gas. [1/3 definitions] |