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feature:
1.Happy and easy to learn
2.Exercise your children practical ability
3.Train your children observation capability,thinking and analytical skills
Learning Points
Archimedes' principle
 
Why submarine can dive in the water, floating, or even hover? This is mainly related to gravity and buoyancy, according to "float of the Law" (or Archimedes' principle), any object in the liquid are subjected to the action of buoyancy, buoyancy equal to the size of the object itself displaces weight of the liquid when the weight of the object is larger than the buoyancy it will sink;. will go up less than buoyancy; equal will hover in the liquid buoyancy, these two forces are equal in magnitude, but the direction is opposite.
     In the water, these two forces will also effect the submarine in a submarine. As described above, the weight of the submarine itself is called gravity, the submarine into the water portion displaces the weight of the sea called the buoyancy, the submarine dive to make it as long as it is greater than the weight buoyancy on the line, then how to increase the weight of the submarine? in the submarine has ballast tanks, as long as the water to empty ballast water cabin, the submarine becomes heavier, then it will be greater than the weight of the submarine the discharge of water weight (ie, greater than buoyancy), the submarine gradually submerged.
When the submarine normally go up, step by step with the high-pressure air ballast water out of the cabin to make it full of air, so that the weight of the submarine underwater reduced, the weight of the submarine when it is less than the same volume of water when the weight (ie, less than the buoyancy), the submarine will go up until it surfaced.

 

 

 

 

 

 

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