Buoyancy
⭐ MasteredBuoyancy is the upward push that a liquid or gas gives to an object placed in it. It helps boats and balloons stay up.
Archimedes discovered buoyancy while he was taking a bath.
All about Buoyancy
Buoyancy is the upward push a fluid gives to an object placed in it. The push equals the weight of the fluid the object pushes aside.
Buoyancy keeps boats afloat, lets swimmers float and helps balloons rise in the air.
You can feel buoyancy when you push a beach ball under water. The harder you push it down, the more the water pushes it back up. The upward push is called the buoyant force.
The size of the buoyant force depends on how much fluid the object pushes out of the way. A huge ship floats because its shape pushes aside enough water to create a buoyant force greater than its weight. Hot air balloons float for the same reason, because the air inside them is lighter than the air around them.
🎮 Try it yourself!
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Real-life uses of Buoyancy
- Designing boats and ships
- Understanding how lifejackets keep people up
- Explaining why hot air balloons lift off
Frequently asked questions about Buoyancy
What causes buoyancy?
Fluids push upwards on objects placed in them, and this upward push is buoyancy.
Why do some heavy ships float?
They are shaped to push aside a large volume of water, which gives enough upward push.