C43 Cap To Back Starter Kit For Pumps Under 21 litres per minute
Starter 4/21/14
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Transcript of Starter 4/21/14
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Starter 4/21/14
• 1. What is the difference between a solid, liquid, and gas?
• 2. How does a boat float?
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Properties of Fluids
2/5/13
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Fluids• Flow
• Have no definite shape
• Ex: gasses and liquids
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Pressure• Applying force to a surface
• F is perpendicular to A• Unit of measure is pascal (Pa) = 1 Newton per
square meter. Since this is small, we usually see kilopascals (kPa).
P = FA
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Pascal’s Principle• The shape of a container has
no effect on the pressure of the fluid it contains at any given depth.
• Any change in pressure applied at any point is transmitted throughout the fluid.
• Ex: squeezing a tube of toothpaste.
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Hydraulic Lifts
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Buoyant Force• The upward force on an object from the fluid. • If the buoyant force is greater than or equal to
the weight of the object, it will float.
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Archimedes Principle• The magnitude of a buoyant force is equal to the
weight of fluid displaced.
• Fish and air bladders
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Bernoulli’s Principle• As the velocity of a fluid increases, the pressure
exerted by the fluid decreaseshttp://www.youtube.com/watch?v=P-xNXrELCmU http://www.youtube.com/watch?v=WDGNcmEOjs4
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Cohesive Forces• Forces of attraction that particles exert on each
other.
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Surface Tension• Tendency of the surface of a liquid to contract to
the smallest possible area.• Top molecules are attracted to the sides and
downward, but not upward.
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Adhesion• Attractive force between particles of different
substances.
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Capillary Action• Water rises in a glass
tube because the adhesion between glass and water is stronger than the cohesive force of water.
• Water rising upward in soil to plant roots
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Evaporation• Fast moving particles on the surface of a
liquid “escape.” – break free of cohesive force.
• Since kinetic energy is lost, evaporation has a cooling effect
• Liquids that evaporate quickly are called volatile liquids (rubbing alcohol)
• Humid days reduce evaporation of our perspiration, so we feel hotter.
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Condensation• If the kinetic energy
decreases, particles turn back to a liquid.
• What is the Dew Point on the weather forecast?