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Transport in Plants - Coggle Diagram
Transport in Plants
Introduction
Density
How much space an object or substance takes up in relation to the
amount of matter in that object or substance. The amount of mass per unit of volume
If an object is heavy and compact, it has a high density. If an object is light and takes up a lot of space, it has low density.
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Mass
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Unlike weight, mass doesn’t change due to changes in gravity. A huge block of ice, for example, weighs much less in space because of lower gravity, but its mass is always the same.
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Archimede's principle
Archimedes' principle states that a body immersed in a fluid is subjected to an upwards force equal to the weight of the displaced fluid.
When an object is dropped into water, some of the water is displaced. This means the water rises upwards as the object or person pushes water out of the way.
At the same time buoyancy is pushing up the object which changes its weight. If the weight of the object in the water is heavier than the amount of water displaced the object will sink
If the weight of the object and amount of water displaced are the same or the weight is less, the object will float.
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Submarines
A submarine can float because the weight of the water that it displaces is equal to the weight of the ship. This means the pressure of the submarine pressing down on the water is the same as the pressure of the water pushing up on the ship.
the submarine relies on special tanks that can be filled with water or air. To return to the surface, the tanks are filled with air. This makes the submarine less dense than the water around it, causing the sub to float to the surface.
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