-- Its temperature.
-- The amount of water vapor (humidity) in it.
-- The amounts of any other stuff in it.
The changes are caused by the weight of air above it.
The weight of air is known as atmospheric pressure. A person may not physically feel the weight of air, but changes in atmospheric pressure can sometimes be felt in the ears or head, especially during changes in altitude like going up a mountain. This can cause discomfort or even pain in some individuals.
When a balloon is blown up, its weight remains the same. The air inside the balloon has mass, but it is not the weight of the balloon itself that changes. The buoyant force of the surrounding air supports the weight of the balloon.
A barograph is an instrument that records atmospheric pressure over time, translating the concept of "writing weight" into a visual format. It uses a sensitive barometric sensor that responds to changes in air pressure, which is influenced by the weight of the air above it. As the pressure changes, a pen attached to a moving arm traces the variations on a rotating drum, effectively "writing" the weight of the atmosphere in graphical form. Thus, it captures and displays the weight of air as changes in atmospheric pressure.
Gravity. Atmospheric pressure is the weight of a column of air. Of course, the temperature of that air changes it's density and therefore it's weight (i.e. pressure)
Sound itself does not have weight as it is a form of energy produced by vibrations. Changes in sound intensity can be perceived as changes in volume, but this is not related to weight. Sound can be affected by the medium it travels through, such as air or water, but this does not change its weight.
The velocity, weight and shape of the bullet, and the density of air through which the bullet moves changes a firearm's range.
Barometric pressure is caused by the weight of the air pushing down on the Earth's surface. It is influenced by factors such as temperature, altitude, and weather patterns. Changes in barometric pressure can indicate changes in weather conditions.
the atmosphere on a surface. It is caused by the weight of air above that surface pressing down. Changes in air pressure can affect weather patterns and can also impact our bodies, such as causing ear discomfort during changes in altitude.
When a balloon is blown up, its weight remains the same. The weight of the balloon is determined by the amount of air it contains and the material it is made of. Blowing up a balloon simply changes its volume, not its weight.
It is the weight of the air itself that causes air pressure. Fluctuations occur due to changes in wind and temperature. We live in air pressure of about 15 pounds per square inch.
Well atmospheric pressure changes with elevation and has to due with weight of air. The weight of air depends on it's constituents. Pollutants can change the weight but it's so small it is negligible.