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STEM- Float or Sink

STEM-Cast Away Project focussing on floating or sinking

TermDefinition
Buoyancy Buoyancy is the upward force exerted by a fluid (liquid or gas) on an object immersed in that fluid.
Float To stay on the surface of a liquid without sinking. Objects that are less dense than the liquid they're in will float.
Density How closely packed the molecules in an object are. Objects with lower density are more likely to float.
Displacement Objects that are less dense than the fluid they are in will experience a greater buoyant force, while those denser than the fluid will experience less buoyancy.
Submerge To go underwater or be covered by a fluid, like a boat's hull going beneath the water's surface.
Surface Tension The force that causes the surface of a liquid to act like a sort of "skin" that can support light objects, such as small insects or paperclips.
Gravity The strength of gravity in a particular location influences buoyancy. In a stronger gravitational field, objects have a greater weight, affecting their buoyancy.
Ballast Weight or material that can be added or removed from a vessel to control its buoyancy, such as in a submarine.
Neutral Buoyancy When an object neither sinks nor floats but remains suspended in a fluid, like how astronauts train underwater.
Hydrodynamics The study of how fluids (like water) flow and interact with objects moving through them.
Hydrofoil A special wing-like structure that lifts a boat's hull out of the water, reducing drag and increasing speed.
Salinity and Temperature The properties of the fluid, such as its salinity and temperature, can affect its density. Seawater, for example, is denser than freshwater due to its higher salt content, which affects buoyancy in marine environments.
Flotation Device A life jacket or other equipment designed to help a person stay afloat in the water.
Sink When an object is denser than the fluid it's in, it will sink to the bottom.
Lift The upward force that allows objects to rise in a fluid, like a helium balloon floating in the air.
Archimedes' Principle This principle states that the buoyant force on an object is equal to the weight of the fluid displaced by the object. It's named after the ancient Greek scientist Archimedes.
Bilge The lowest part of a boat's hull, where water collects, and it needs to be pumped out to prevent sinking.
PFD Abbreviation for Personal Flotation Device, which is a life jacket or life vest used to keep a person afloat in the water.
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