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Length, Volume, Mass, and Density. Length. How “long” something is A ruler is used to measure length. Practice. Complete the Length worksheet. Volume. How much space an object takes up Liquids and solids can have volume. Finding volume of a liquid.

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## Length, Volume, Mass, and Density

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**Length**• How “long” something is • A ruler is used to measure length**Practice**• Complete the Length worksheet**Volume**• How much space an object takes up • Liquids and solids can have volume**Finding volume of a liquid**• Pour liquid into a graduated cylinder and read from the bottom of the meniscus (curved line of liquid)**Be careful to find out how much each line on the graduated**cylinder is worth!**Finding Volume of a solid**• 2 ways to measure volume of a solid: • regularly shaped object • Length X width X height • Ex. L = 5cm and W=3cm and H=5cm so volume would be 75cm3**How would you find the volume of an irregularly shaped**object like the one below?**Water Displacement**• Put water into graduated cylinder • Measure volume • Carefully place object in water • Measure volume again • Subtract the first volume from the second volume to find the volume of the object**Practice**• Complete the volume activity**Mass**• How much of something there is**How is mass different than weight?**• While mass is how much “stuff” there is, weight is the pull of gravity on the stuff • weight = mass X the force of gravity • You weigh less on the moon than on earth because there is less gravity even though the amount of “stuff” is the same**Finding the mass**• Use a triple beam balance**Practice**• Complete the mass activity**Density**• It’s a measure of how compact an object is • Defined as mass per unit volume • Density = mass volume**Mass**Density Volume

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