# humidity

Functions to compute relative humidity, absolute humidity, wet bulb 
temperature, and other values related to humidity of air, given 
partial data.

## General architecture

### The packet

The 'packet', in the terminology of this library, is a map which has bindings
for some of the following keywords:

1. `:actual-humidity`
2. `:actual-vapour-pressure
1. `:dew-point`
2. `:pressure-pascals` 
3. `:pressure-millibars` 
4. `:saturation-pressure`
5. `:relative-humidity`
6. `:temperature`
7. `:temperature-celsius` 
8. `:temperature-kelvin` 

These keywords represent variables in the pressure equations, and they are all
to a degree inter-related; so if you have (or can assume) some of them, you can
compute others.

Rather than having a mess of functions all of which call one another, which 
seemed likely to result in horrible messes and potential infinite recursion,
there is one central function, `humidity.core/resolution`, which takes a 
partial package and repeatedly tries to compute the values for more variables
until it can compute no more, and then returns the enhanced packet.

At present there are no checks to ensure that the packet makes sense.

Associated with each variable there is a namespace which takes a packet, and,
if that packet contains enough information to compute that variable, returns
a numeric value, else `nil`.