airmail is cheaper and quicker, better . choose EMS cheaper than
Surface mail is overseas mail that goes by ship rather than by air. Parcel mail is for parcels.
it can be easily lost
Surface mail is mail that is sent via a ship (surface of the earth) rather than buy Airplane (air above the earth!)
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.
clear calm afternoon
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).
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.
the difference between dry air and atmospheric air is that atmospheric air contains water vapor but dry air contains no water vapor
It's called condensation. The temperature difference between the bottle and the surrounding air - causes water to condense out onto the bottle's surface.
difference between laminar air flow & reverse laminar air flow
difference between air jet loom and water jet loom
the difference between inhale and exhale is when you inhale you get more oxygenthan you exhale