True or False
We feel atmospheric pressure.
What is false?
The relative atmospheric pressure when the mercury in the tube of a barometer is at 29.9 inches, or 760 mmHg (mm of mercury).
What is average atmospheric pressure?
The mass of air surrounding a planet.
What is atmosphere?
Narrow bands of high-speed winds that circle the earth, blowing from east to west.
What are jet streams?
The average weight of a 1" x 1" column of air from sea level to the top of the earth's atmosphere.
What is 14.7 pounds?
The air at the top of Mt. Everest has higher atmospheric pressure and is hotter.
What is false?
The relative atmospheric pressure when the mercury in the tube of a barometer is less than 29.9 inches, or 760 mmHg (mm of mercury).
What is lower-than-average atmospheric pressure?
The pressure exerted by the atmosphere on all objects within it.
What is atmospheric pressure?
Energy that is transferred as a consequence of temperature differences.
What is heat?
Barometers use mercury for the liquid instead of water for this reason.
What is... Density. (The density of mercury keeps the height of the barometer more manageable. A water-based barometer would need to be more than 33 ft tall!)
Most of the earth's weather takes place in the troposphere, the first region of the homosphere.
What is true?
The relative atmospheric pressure when the mercury in the tube of a barometer is higher than 29.9 inches, or 760 mmHg (mm of mercury).
What is higher-than-average atmospheric pressure?
Instrument that measures atmospheric pressure, which is useful for tracking & predicting weather.
What is a barometer?
A measure of the energy of random motion in a substance's molecules.
The 3 regions called troposphere, stratosphere, & mesosphere are part of this layer of earth's atmosphere.
What is the homosphere?
A frozen vial of water in the troposphere will get warmer as it travels up to the stratosphere, and melt near the top of it around the stratopause.
What is true? (The temperature there gets up to 40 degrees Farenheit, warmer than the freezing point of 32 degrees Farenheit.)
This unit of measurement makes it very easy to compare an atmospheric pressure measurement to the average sea-level atmospheric pressure. It is abbreviated "atm."
What is atmosphere?
The lower layer of earth's atmosphere, from ground level to roughly 80 km/50 miles above sea level. It is uniform in its composition.
What is homosphere?
In the heterosphere (above the homosphere), the region of the atmosphere between the altitudes of roughly 80 km and 460 km.
What is thermosphere? (Can be considered the 2nd-to-last layer of "outer space" and is where most space shuttle missions occur.)
When you go up in altitude, air pressure does this.
What is decreases?
Changes in matter from solid to liquid to gas are due to changes in the energy of motion of the AIR involved.
What is false? (These changes are due to changes in the energy of motion of the MOLECULES involved.)
Give the number and unit for average sea-level atmospheric pressure of 14.7 pounds per square inch.
The upper layer of earth's atmosphere, higher than roughly 80 km/50 miles above sea level. It is not uniform in its composition. There is less oxygen the higher it gets.
What is heterosphere?
In the heterosphere (above the homosphere), the region of the atmosphere above an altitude of roughly 460 km.
What is the exosphere? (Can be considered the last layer of "outer space" before interplanetary space.)
When you go up in altitude, the temperature does this.
What is "changes"? (It decreases up to the troposphere, increases through the ozone layer and stratosphere, and then decreases again in the mesosphere and beyond.)