Chapter 4 Flashcards
What is the standard unit of pressure?
Pascal
What does The Equation of State (Ideal Gas Law) tell you?
The equation tells us if the air density increases while temperature is held constant, the pressure will increase, and at constant density, an increase in temperature leads to an increase in pressure.
What is the standard instrument for the measurement of pressure?
mercury barometer
What is Barometric pressure?
it is often expressed as the height
of the column of mercury in a barometer,
What is an isobar?
It is a line that connects points having exactly the same sea level pressure drawn at intervals
of 4 mb on surface weather maps.
What is the pressure gradient?
how fast pressure is changing
The vertical pressure gradient force and the force of gravity are normally of nearly equal value and operate in opposite
directions, a situation called
hydrostatic equilibrium
What does the Coriolis force do?
It moves/turns the earth to the right
What is the other factor that influences the movement of air?
Friction
It slows the wind speed down, near the earths surface
What is The Equation of Motion
Wind=PGF + Coriolis - friction
(speed) (direction) (speed)
Pressure gradient up is equal to the gradient pull
What does the high pressure do in the northern and southern hemisphere?
Northern- spins outward clockwise
Southern- counter clockwise
Closed low-pressure systems are called?
cyclones
Elongated zones of high and low pressure are
called?
ridges and trough
