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Why does a block of plastic realeased under water come up to the surface of water?
Wiki User
∙ 15y ago
Any time a mass is less dense than the liquid it is in, it will float. Said another way, when a volume of anything weighs less than the weight of the same volume of the liquid, it will float in that liquid. This applies to all fluids and gases, including why a hydrogen or helium balloon rises in the atmosphere, and how a submarine floats or sinks by altering the amount of weight on board (by intaking or expelling water, while its volume is a constant.) The plastic floats because it is less dense than the water (less weight compared to the same volume of water).
Wiki User
∙ 15y ago
Wiki User
∙ 12y agoAny time a mass is less dense than the liquid it is in, it will float.
Said another way, when a volume of anything weighs less than the weight of the same volume of the liquid, it will float in that liquid.
This applies to all fluids and gases, including why a hydrogen or helium balloon rises in the atmosphere, and how a submarine floats or sinks by altering the amount of weight on board (by intaking or expelling water, while its volume is a constant.)
The plastic floats because it is less dense than the water (less weight compared to the same volume of water).
Read more: Why_does_a_block_of_plastic_realeased_under_water_come_up_to_the_surface_of_water
Wiki User
∙ 12y agobecause its density is lower than the density of water
Wiki User
∙ 7y agoThe wood is not as dense as the water, and weighs less than the water it displaces. Basically, the heavier water is pushing the lighter block of wood to the top of the water.
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The density of water is greater than that of plastic. When a block of plastic is under water, the magnitude of the buoyant force or upthrust exerted by water on the block is greater than the magnitude of the weight of the block. Hence, the block of plastic released under water will come up to the surface of water.
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