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| Matter is anything that has mass and takes up space. Your clothes, games and books are all matter |
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| A characteristic of matter that can be observed or measured without changing the composition. Ex's: color, taste, texture, length |
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| Density is the amount of mass in a known volume of an object or substance. An object will float in a fluid that is more dense than itself and sink in a fluid that is less dense than itself. |
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| Sound is a form of energy that we hear produced by vibrating objects. Dolphins can communicate with each other underwater through sound vibrations. |
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| Condensation is when matter changes from a gas to a liquid. Clouds are evidence of condensation. |
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| An object's melting point is when its temperature gets hot enough to change from a solid to a liquid. The melting point of ice is 0 degrees C. |
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| A reflection is when light rays bounce off a surface. What you see in the mirror is a reflection. |
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| A mixture is a combination of two or more substances that do not form a new substance. A bag of trail mix is an example of a mixture. |
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| Refraction is when light waves are bent by a substance. Often when light is refracted the object will appear bigger than normal, smaller than normal, or it will look bent. |
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| An object's mass is the measurement of the amount of matter in the object. All solids, liquids and gases have mass because they are all made up of matter. |
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| A conductor is a material that allows heat energy, sound energy or electricity to pass through easily. Metals are great examples of conductors. |
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| An insulator is a material that stops or slows the flow of heat, electricity or sound. Pot holders are the plastic covering on wires are excellent insulators. |
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