# Mathematica: The Webel Units` package has Quantity variables for frequently used units using a naming convention 'unit\$[Symbol]' or 'unit[DescriptiveName]' or unit[Acronym], each with a corresponding '\$unit...' for the units identifier String(s).

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Even with the Wolfram Alpha lookup using `[CTRL]=` entering the unit of a Quantity can be tedious, especially for complex units, such as this for a heat transfer coefficient:

``````
Quantity[1,(("Watts")/("Kelvins" ("Meters")^2))]
``````

The following unit-alias naming convention works well:

For a unit that has a clear unit symbol use the name `unit\$[unitSymbol]`, where `[unitSymbol]` is usually the official SI (ISQ) symbol. You can then type 'unit\$' and prompt on it to choose the desired unit. For example:

``````
unit\$W = Quantity[1, "Watts"];

unit\$kW = Quantity[1, "Kilowatts"];

unit\$m = Quantity[1,"Meters"];

unit\$mm = Quantity[1,"Millimeters"];
``````

You can also use just the prefix 'unit' together with a descriptive name to enforce uniformity across a project:

``````
unitHeatLoad = Quantity[1, "Kilowatts"]; (* Industry-typical non-SI choice *)

unitHeatTransferCoefficient = Quantity[1,(("Watts")/("Kelvins" ("Meters")^2))];
``````

Frequently used ones can be further aliased thus:

``````
unitHTC = unitHeatTransferCoefficient; (* Short-cut alias *)
``````

This makes for far more readable code, and your typing hands will be happier. You can also search easily for unit usages. And you can change unit conventions across a project more easily.

However, be aware that multiplication, addition, and division of Mathematica Quantities involving units for temperature have special treatment!

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