Mass, Volume, Etc.
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    Mass is the measure of inertia in an object.  Mass is never changed no matter where a person is (the earth or the moon etc).  Mass cannot be created or destroyed and is always measured in kilograms.  However, there is a difference between mass and weight.  Mass is the amount of matter an object has, whereas weight is the amount of force that gravity exerts onto an object.  The more the force of gravity is present, the more weight an object will have.  Weight is measured in Newton's (.2 Newton's is equal to one pound).

    Gravity is the property that attracts object to the earth.  Gravity extends everywhere and never stops at any given point.  For the builders of the Great Wall gravity was important because it was difficult to lift blocks and other objects off of the ground because gravity was pulling the objects down.  The builders were lifting up against gravity. 

    Volume is the amount of space taken up by a solid figure.  Volume is measured in cubic units. Volume can be expressed in a liquid form as well.

    The Great Wall of China is the most massive project of all time. The bricks within the Wall have individual masses and, depending on how massive, the builders had to apply great forces to these blocks.  Each block also has a specified volume and the Wall itself also has a large volume.

This Page was last edited on Thursday, July 27, 2000 .

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