What is the meaning of air parcel?

An imaginary volume of air to which may be assigned any or all of the basic dynamic and thermodynamic properties of atmospheric air.

How does an air parcel work?

Imagine a block of air, or air parcel, rising upward through the atmosphere. The air parcel expands as it rises and this expansion, or work, causes the temperature of the air parcel to decrease. As the parcel rises, its humidity increases until it reaches 100\%.

What makes an air parcel cool?

A rising parcel of air expands because the air pressure falls with elevation. This expansion causes the air to cool.

Why does an air parcel rise?

A parcel of air expands and becomes less dense as it rises. This occurs because the air pressure lowers around the parcel as it increases in altitude. The volume of the parcel increases since it is expanding. The temperature of a rising parcel always cools even though it is becoming less dense.

How do you use air parcel in a sentence?

Air is a poor conductor of heat, so a parcel of air will rise and fall without exchanging heat. Cook for 20 mins, then open the parcel and scatter over the spring onions and coriander. Convection comes to equilibrium when a parcel at air at a given altitude has the same density as its surroundings.

How many forces are acting upon an air parcel?

To an observer who is stationary with respect to the Earth’s surface, there are four major forces acting on an air parcel in the atmosphere: the gravitational force, the pressure gradient force, the Coriolis force and the frictional force.

Are air parcels real?

A parcel is a bubble of air of no definite size that we generally assume it retains its shape and general characteristics as it rises or sinks in the atmosphere. In a stable atmosphere, the rising parcel becomes cooler than the surrounding environment slowing or ending its rise (left image).

What happens when an air parcel sinks?

As an air parcel sinks the pressure of the surround air around it increases. We know from Gay-Lussac’s law that pressure and temperature are proportional. Therefore as the pressure increases the temperature increase. As the air continues to sink it will continue to dry out.

When an air parcel loses energy what happens to the air parcel?

The air parcel then loses more energy, causing more rainfall. Wind pushes air parcels even higher in the troposphere, where it is colder. The air parcels will then lose more energy and more rain can happen.

What increases in a rising air parcel?

PARCEL IN GENERAL. A parcel of air expands and becomes less dense as it rises. This occurs because the air pressure lowers around the parcel as it increases in altitude. The volume of the parcel increases since it is expanding. The temperature of a rising parcel always cools even though it is becoming less dense.

What does air parcel mean?

air parcel (plural air parcels) (physics, meteorology) An imaginary body of air to which may be assigned any or all of the basic dynamic and thermodynamic properties of atmospheric air.

What is the abbreviation for parcel airlift?

How is Parcel Air Lift abbreviated? PAL stands for Parcel Air Lift. PAL is defined as Parcel Air Lift somewhat frequently.

What is an air container?

air container. A solid vessel comprised of a storage unit, aircraft restraint connectors and a flat bottom which allows roller bed support. The container must be compatible with aircraft cargo handling systems and equipment in order to be used for air freight transportation.