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Science > Pressure > Flashcards

Pressure Flashcards

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1
Q

exerted whenever a force is applied over an area

A

pressure

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2
Q

the force acts over a small area and so produces a _

A

high pressure

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3
Q

the force acting over a larger area produces _

A

lower pressure

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4
Q

force per unit area

A

pressure

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5
Q

the formula in getting pressure

A

force/area

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6
Q

measures the pressure

A

N/m^2 (newtons per square meter) or pascals (Pa)

can also be measured in
newtons per square millimeter/centimeter
N/mm^2) or (N/cm^2

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7
Q

Pressure depends on two things

A
  • how much force is applied

- how big the area on which the force is applied

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8
Q

in liquids, pressure _ with depth

A

increases

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9
Q

in liquids, pressure acts _ in all directions

A

equally

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10
Q

the pressure caused by a column of liquid can be calculated using the equation:

A

pressure = height of column x density of the liquid x gravitational field strength

pressure = hpg

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11
Q

density is measured in _

A

kilograms per meter cubed (kg/m^3)

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12
Q

gravitational field strength is measured in _

A

newtons per kilogram (N/kg)

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13
Q

it is caused by the weight of all the air in the atmosphere pressing down on earth

A

air pressure

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14
Q

air pressure is also known as _

A

atmospheric pressure

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15
Q

air pressure changes with the height and also when air _ or _

A

warms up, cools down

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16
Q

changes in air pressure causes changes in the _

A

weather

17
Q

when air rises, it leaves behind an area of _, because the upward-moving air is not pressing down hard on the surface

A

lower pressure

18
Q

areas of _ are formed where air is sinking back down, and so pushing down harder

A

high pressure

19
Q

there are many areas of high and low pressure above the Earth’s surface due to _

A

uneven surface heating

20
Q

air moves from higher to lower pressure area forming _

A

winds

21
Q

areas of low pressure with the lowest pressure at the center; usually brings wet, cloudy weather

A

lows

22
Q

areas of high pressure with the highest pressure at the center; brings sunnier and dryer weather

A

highs

23
Q

A device used to measure atmospheric pressure.​

It was invented in 1643 by Italian scientist Evangelista Torricelli (1608-1647)​

A

barometer

24
Q

The SI unit of pressure

A

pascal

25
Q

Another unit of pressure commonly used in engineering and used for measuring tire pressure is _

​

A

pounds per square inch (psi).

26
Q

result of the mass of air being pulled toward the center of the earth by gravity

A

atmospheric pressure

27
Q

the higher the elevation, the _ the air

A

lesser/thinner

28
Q

expressed based on the height of the mercury inside the column that the gas pressure can support

A

units of pressure

29
Q

the unit _ is also known as torr, in honor of Torricelli

A

mmHg (millimeters of mercury)

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