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History
Pump
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A pump is a device that moves fluids, or sometimes slurries, by mechanical action, typically converted from electrical energy into hydraulic energy.
A small, electrically powered pump
A small, electrically powered pump
A large, electrically driven pump for waterworks near the Hengsteysee, Germany
A large, electrically driven pump for waterworks near the Hengsteysee, Germany
Antique "pitcher" pump (c. 1924) at the Colored School in Alapaha, Georgia, US
Antique "pitcher" pump (c. 1924) at the Colored School in Alapaha, Georgia, US
Screw pump
Screw pump
Liquid
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A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a nearly constant volume independent of pressure. It is one of the four fundamental states of matter, and is the only state with a definite volume but no fixed shape.
The formation of a spherical droplet of liquid water minimizes the surface area, which is the natural result of surface tension in liquids.
The formation of a spherical droplet of liquid water minimizes the surface area, which is the natural result of surface tension in liquids.
A lava lamp contains two immiscible liquids (a molten wax and a watery solution) which add movement due to convection. In addition to the top surface,
A lava lamp contains two immiscible liquids (a molten wax and a watery solution) which add movement due to convection. In addition to the top surface, surfaces also form between the liquids, requiring a tension breaker to recombine the wax droplets at the bottom.
Cavitation in water from a boat propeller
Cavitation in water from a boat propeller
Surface waves in water
Surface waves in water