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What is the difference between surface mail and parcel mail?
Surface mail is overseas mail that goes by ship rather than by air. Parcel mail is for parcels.
What are the disadvantages of air mail and surface mail?
it can be easily lost
What is surface mail?
Surface mail is mail that is sent via a ship (surface of the earth) rather than buy Airplane (air above the earth!)
What is surface air mail SAL?
SAL mail is a cheap way to get mail to and from Japan. It cost less than usual air mail, but is usually faster than regular snail mail. SAL= Surface Air Lifted. Basicall, while on the ground the mail is transported like normal ground mail, but when going from one country to another, it is in the same class as air mail. At it's destination, the handling is back to regualr mail.
How the dry air increases evaporation?
Dry air increases evaporation because it has a lower relative humidity, which creates a larger difference in vapor pressure between the water surface and the air. This difference in vapor pressure drives the movement of water molecules from the surface into the air, increasing the rate of evaporation.
During the afternoon the greatest temperature difference between the surface air and the air several meters above occurs on a?
clear calm afternoon
What is the Difference between vertical hood and horizontal hood?
In the horizontal hood the air is blown across the work surface toward the operator (air flow from back to front) and in the vertical hood the air is blown down onto the work surface (air flow from top to bottom).
How long does it take a letter from England to get to Egypt?
The UK Royal Mail website says 5 days for Air Mail, and 2 weeks for surface mail. For a letter these are almost the same price, so you're much better off using Air Mail. For packages the prices differences are greater, so you may prefer the less-expensive Surface Mail if you have unlimited time.
Difference between laminar air flow and reverse laminar aire flow?
difference between laminar air flow & reverse laminar air flow
What is the difference between water loom and air jet loom?
difference between air jet loom and water jet loom
Why droplets of water appears on the outer surface of the cool water bottle?
It's called condensation. The temperature difference between the bottle and the surrounding air - causes water to condense out onto the bottle's surface.
What is friction between a surface and air?
Friction between a surface and air happens when the surface moves through air, causing air resistance. This frictional force opposes the motion of the object through the air and acts in the opposite direction. It ultimately slows down the object's movement.
