Select the gas.
marbles air inside a beach ball pipe cleaner baseball cap
Solid, liquid, and gas are states of matter. Matter is anything that takes up space. Matter can come in different states, or forms.
When matter is a solid, it has a definite volume and a definite shape. So, a solid has a size and shape of its own.
Some solids can be easily folded, bent, or broken. A piece of paper is a solid. Also, some solids are very small. A grain of sand is a solid.
When matter is a liquid, it has a definite volume but not a definite shape. So, a liquid has a size of its own, but it does not have a shape of its own. Think about pouring juice from a bottle into a cup. The juice still takes up the same amount of space, but it takes the shape of the bottle.
Some liquids do not pour as easily as others. Honey and milk are both liquids. But pouring honey takes more time than pouring milk.
When matter is a gas, it does not have a definite volume or a definite shape. A gas expands, or gets bigger, until it completely fills a space. A gas can also get smaller if it is squeezed into a smaller space.
Many gases are invisible. Air is a gas.
A baseball cap is a solid. A solid has a size and shape of its own. If you put a baseball cap on your head, the baseball cap will still have a size and shape of its own.
A pipe cleaner is a solid. You can easily bend a pipe cleaner. But it will still have a size and shape of its own.
A marble is a solid. A solid has a size and shape of its own. A marble can be made of clear or colored glass.
The air inside a beach ball is a gas. A gas expands to fill a space. The air fills all the space inside the beach ball. If air leaks out, it will expand into the space around the ball.