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Measuring Length

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**SI Measurement System International System of Units**

Developed out of a need for a global measurement system.

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**Advantages of the SI System**

Helps all scientists share and compare their observations and results. Based on the number 10, which is easy to use in calculations.

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SI Measurement System

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Length Length is the long dimension of any object. (the distance between its ends)

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Tool meterstick Base Unit Meter (m)

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To Be Continued… Now: Let’s Measure!!!

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Measuring Volume

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Volume The amount of space an object occupies.

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**Tool graduated cylinder Base Unit Liter (L)**

1 liter = 1,000 Milliliters

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**Measuring Volume Irregular Objects Water Displacement**

Put the object in a graduated cylinder containing water and measure the change in volume of the water.

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**Measuring Volume Rectangular Objects Volume = Length x Width x Height**

Measured in m3 or cm3

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To Be Continued… Now: Let’s Measure!!!

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Measuring Mass

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**Mass The measurement of how much matter an object contains.**

Tool triple beam balance Base Unit gram (g) 1 kilogram = 1,000 grams

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Weight The measurement of the force of gravity on mass.

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Weight or Mass? An object’s weight will change if you move it from Earth to the moon or to other planets, but its mass will stay the same.

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Measuring Density The measurement of how much mass is contained in a given volume. Which means how closely packed or crowded an object is. Most of the time solids are more dense than liquids.

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Which box is more dense?

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Measuring Density Which tool(s) do you think would be used to measure density?

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Calculating Density Density = Mass/Volume Units: g/cm3 or g/ml

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Density Facts Less dense objects will “float” on top of more dense objects. For example, oil will float on water. Oil is less dense than water.

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Density Facts The density of a substance is the same for all samples of that substance. For example, at 4oC pure water has a density of 1 g/cm3

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Density Facts For example, all samples of pure gold have a density of 19.3 g/cm3. Fools gold has a density of 5.0 g/cm3

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**Temperature A measure of how hot (or cold) something is.**

Tool thermometer Base Unit Celsius (oC)

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