what is the changes in temperature that result solely from the expansion or compression of air calles?
362166
That is adiabatic cooling (by expansion). When air is forced to expand (like when it rises) it will become cooler.\n\nWhen air is forcefully compressed, that is adiabatic heating.\n\nThe answer is ADIABATIC TEMPERATURE CHANGES
827547
When you say 'compression efficiency' I think you probably mean 'isothermal efficiency'.\n\nWhen air is compressed part of the work input is used in needlessly heating the air. The ideal, but unattainable, minimum work input will occur when compression is isothermal (i.e. when it takes place at constant temperature).  The efficiency of any real compression process is thus measured against this ideal and is called the 'isothermal efficiency'.\n\nIsothermal efficiency = (isothermal work input)/(actual work input)
397453
number 4 is partially right. By Gay Lussac's Gas Law, pressure DOES affect temperature directly - more pressure, more temp.
330764
Either drop the temperature (remove the enthalpic - heat - energy) or increase the pressure (the less space it has to move freely the closer to solid it becomes) or both
179150
If you mean barometric pressure, both higher pressure and lower temperature inrease air density.  This means more available engine power at a given altitude, lower speed and less power needed to obtain a given amount of lift, and more loss due to drag at a given speed.
1182013
Air molecules are spread apart when its hot, and closer together when cold, which reflects on how sound is traveled
570511
both.  the friction, as well as creating its own heat, slows the airflow, which aggrivates the compression along the leading edges.\n\nI'm pretty sure.  don't put this on a physics test and then blame me.
417291
Once the rising air depletes whatever inertia it had from rising through air resistance, it basically stops rising.\n\nNote that if it was rising, it was likely because it was less dense than the surrounding atmosphere in the first place.  This is likely because it was warmer than the surrounding atmosphere (warmer air is less dense than cooler air).  \n\nSo what densifies this warmer, less dense air?  Well, it eventually loses its heat energy to the surrounding air, making it roughly the same temperature, which also makes it roughly the same density.
141597
If there was no sunshine and no vertical air motion, cold air would settle to the surface, and temperature would increase going up in the atmosphere (and we'd all be dead soon ;) ). Because the ground is always radiating away heat (though often receiving more during daytime from the sun), there is a tendency for that to occur. Note the polar regions for example - during winter there is a semi-permanent temperature inversion (increase of temperature with altitude).\n\n2 things which counter the tendency for inversion are solar heating and vertical air motion.\n\nSunshine heats the ground, heat is conducted to air directly above the ground, and convection transports it up into the atmosphere. Cooling/heating of air by radiation is a slower process, so heat builds as spring and summer progress (at mid & high latitiudes) - especially in the lower atmosphere.\n\nAir moving vertically in the atmosphere (up or down) does so at the adiabatic lapse rate, which is 10 °C per km for dry air and less for saturated air (varies depending with temperature - averages about 6-7°C per km). Rising air cools at that rate, and subsiding air heats at the rate. Thus vertical air motions act to heat the lower atmosphere and cool the higher.\n\nThe combined effect of those, as a few people mentioned, is that temperature on the average decreases with altitude in the troposphere - at a rate of 6.5 °C per km (3.6 °F per 1000 ft.). Yet the lapse rate varies depending on conditions. Air during a clear night normally increases directly above the surface, strong inversions may occur during winter and ahead of warm fronts, and air can decrease at the dry adiabatic rate or briefly greater during a warm, sunny spring day. Etc.
795464
wow... opposite answers to the same question... hmmm In a sense, they are both correct. The volumetric changes experienced by solids due to temperature changes is very small, but there is a slight change indeed. Every solid has its own coefficient of volumetric change for every degree change in temperature. A prime example of solids changing volume are the expansion joints you see in bridges. Also, I think the empire state building is like 6 inches taller in summer than in winter... something like that. Gasses on the other hand experience much larger volumetric changes. Temperature as well as pressure will greatly affect the volume of a gas. Consider oxygen, it can be compressed to a liquid. \n\nOn the other hand, let me second guess this question, maybe it should read, why can a gas be compressed and not a liquid? In a gas, the molecules are spaced wide apart, farther apart than their electric charges do not affect the molecule next to them. In a liquid, the molecules are packed as tight as they physically can be packed. They cannot be compressed farther. Only temperature can affect the volume of a liquid as mentioned above. Hope this helps some!
271092
as the temp goes up the molecules of gas move faster and collide more often with more energy into the balloon increaseing pressure and expanding the balloon.  As it cools the opposite happens.  Draw your own diagram!
775141
Proportionate. Increase in temperature results in increased pressure.
1171639
When the temperature rises, the particles of the mercury in the thermometer gain kinetic energy. This means that they start moving around more vigorously. The particles push away neighbouring particles. This increases the space between the particles and causes an increase in the volume of a mercury. Expansion is said to have occured.
868800
It increases the temperature briefly.  Then entropy takes over and it assumes the ambient air temperature.
831873
Is it referring to the heat load calulation for air con
1128521
gas cools down if it expands suddenly.\n\nsimilar principle is used in AC and refrigerators.
1002501
simple answer: expands till you heat it enough, then it breaks apart. (The gas breaks apart at the molecular level)\n\nbetter answer:\n\nWhen you increase the temperature of a substance the molecules store the energy in different forms. Forms such as vibrations, stretches, and translational motion. As the temperature is put in the system the air will increase its molecular motions (vibrations, stretches, translations...) the air becomes hot and the molecules move much quicker due to absorbed thermal energy. If you heat it enough you will rip apart the molecules and possibly start seeing a purple plasma. You can do this easily with a high voltage teslacoil.\nIf the closing material is fragile enough you can cause a pop! \n\nAdditionally, when fluids are heated the oxygen is removed slowly thus reheating can lead to superheating.\n\nAs you heat gasses, depending on their stucture, you can begin different modes of motion and change the heat capacity.