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Measuring Matter

Measuring Matter. Weight and Mass. Weight is a measure of the force of gravity on you. Example: If you were to measure your weight with a scale on the moon, you would weigh less due to the lesser force of gravity.

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Measuring Matter

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  1. Measuring Matter

  2. Weight and Mass • Weight is a measure of the force of gravity on you. Example: If you were to measure your weight with a scale on the moon, you would weigh less due to the lesser force of gravity. • The Mass of an object is the measurement of the amount of matter in the object. If on the moon the mass of your body stays the same. Unlike weight the mass of an object does not change depending on location even when the force of gravity changes. The Mass of an object is a physical property.

  3. Units of Mass • To measure the properties of mass, Scientists use the International System of Units (SI). • The SI unit of Mass is the Kilogram (kg) • Usually we will use the Gram (g) • There are exactly 1,000 grams in a kilogram.

  4. Which has more Mass? • 1. You will be given several objects to look at. Do not touch the objects just look at them. • 2. On your own paper predict which object is lightest, and so on. Number them on your paper. • 3. Use the triple beam balance to find the mass of each object. • 4. Based on the masses, list them again with the lightest first. • How did your predictions compare to your findings? Are the bigger objects always heavier than the smaller objects? Why or Why not?

  5. Volume • The amount of space that matter occupies is called its volume. • Its easy to see that solids and liquids occupies space but as you blow up a balloon you can see that gas also occupies space. • Units of Volume- Common units of volume include the liter (l), milliliter (mL), and cubic centimeter (cm³).

  6. Calculating Volume • The volumes of solid objects are usually expressed in centimeters. • Volume= Length x Width x Height • Units= cm x cm x cm = cm³

  7. Density • Density relates the mass of a material in a given volume. • Density is determined by dividing the mass by the volume. • Density= Mass/Volume If we have a block of wood with a mass of 200 g and a volume of 100 cm³. What is the density?

  8. Answer • 2 g/cm³

  9. Using Density • Density is a physical property and can be used to identify a unknown substance.

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