The answer is a body of air.
This forms a front it can be a cold or warm front
warm air mass and cold air mass
A large body of air with relatively uniform properties is called an air mass. Air masses are characterized by their temperature and moisture content, which is influenced by the region over which they form. When an air mass moves over a different area, it can bring its unique weather conditions to that region.
Yes air has mass. It is the mass of the air above a point on earth that is responsible for the air pressure.
The mass of the bag with air will be the sum of the mass of the bag itself and the mass of the air inside it. The mass of the air can be estimated by knowing the dimensions of the bag and the density of air at the given conditions.
An Warm air mass
the cold air mass took the place of the large air mass
the mass air flow sensor detects the flowing of mass air into the engine while the mass air flow meter detects the amount of mass air flowing into the ingine.
If you mean when a mass of cold air meets a mass of warm air, then a front is created.
the result of air mass/air weight is air pressure.
The warm air mass
A maritime polar air mass is characterized as a cold and moist air mass.