Fluid Fundamentals
Air and water both belong to this category of matter.
What are fluids?
Fluid friction acting against a moving object is also called this.
What is drag?
Density compares an object’s mass to this measurement.
What is volume?
This instrument measures atmospheric pressure.
What is a barometer?
As air pressure increases, air density does this.
What is increases?
Fluids have no definite shape, so they take the shape of this.
What is their container?
Objects with this type of shape minimize resistance as they move through a fluid.
What are streamlined objects?
The mathematical formula used to calculate density.
What is density equals mass divided by volume? D=M / V
Atmospheric pressure does this as altitude increases.
What is decreases?
As air temperature increases, air density does this.
What is decreases?
This property describes a fluid’s resistance to changes in shape or motion.
What is viscosity?
As an object’s speed increases, fluid friction does this.
What is increases?
Two objects with equal volumes can have different densities when this property differs.
What is mass?
Name one unit used to measure atmospheric pressure.
What are inches of mercury, millibars, or pounds per square inch?
Increasing this measure of water vapor in the air slightly decreases air density.
What is humidity?
Honey moves more slowly than water because of this property.
What is higher viscosity?
Friction creates this layer of stagnant air along an airfoil.
What is the boundary layer?
Of air and water, this substance is more dense.
What is water?
This term describes the rate at which atmospheric pressure decreases as altitude increases.
This term describes the rate at which atmospheric pressure decreases as altitude increases.
Name the three atmospheric factors that affect air density.
What are pressure, temperature, and humidity?
This effect causes a moving fluid to attach to a surface and flow along it.
What is the Coanda effect?
Name three external characteristics of an object that affect fluid friction.
What are size, shape, and material?
Two substances have the same volume, but Substance A has twice the mass of Substance B. This substance is more dense.
What is Substance A?
For every 1,000-foot increase in altitude, atmospheric pressure decreases by approximately this amount.
What is 1 inch of mercury?
These three conditions combine to produce poor takeoff and climb performance.
What are high temperature, high altitude/low pressure, and high humidity?