# Shared Flashcard Set

## Details

Chapter 20: Gases Questions
Chapter 20: Gases Questions
13
Physics
01/01/2012

Term
 Gases and liquids both ____________?
Definition
 fluids
Term
 Name an instrument used for measuring the pressure of the atmosphere.
Definition
 barometer
Term
 How does a barometer work?
Definition
 The barometer balances when weight of liquid in the tube exerts the same pressure as the atmosphere outside.
Term
 How is a barometer similar to drinking through a straw?
Definition
 The fluid is pushed up by the pressure of the atmosphere.
Term
 Since atmospheric pressure decreases with altitude, a barometer can be used to determine _________________________.
Definition
 elevation
Term
 Give me an equation for Boyle’s Law:
Definition
 P1V1 = P2V2
Term
 Archimedes’ principle for air:
Definition
 An object surrounded by air is buoyed up by a force equal to the weight of the air displaced.
Term
 Two balloons are inflated to the same size, one with air and the other with helium. Which balloon experiences the greater buoyant force?
Definition
 Both balloons are buoyed with the same buoyant force.
Term
 Is the atmospheric pressure within a tornado high or low?
Definition
 Low
Term
 State: Bernoulli’s principle
Definition
 When the speed of a fluid increases the pressure drops
Term
 The shape of a bird’s feathers ensures that the air passes faster over the _________ surface.
Definition
 top
Term
 When a bird's wing is in flight, the air pressure is ____________ on the top side.
Definition
 lower
Term
 Horizontal flight is possible when _____________ equals weight.
Definition
 lift
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