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Tweaking of README, intro, and tests.

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Simon Brooke 2026-08-14 13:10:12 +01:00
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66
README.md
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@ -12,10 +12,11 @@ I'm using this code to explore human survivability given global warming. The fol
2. [The 'everyone dies' event comes home](https://www.journeyman.cc/blog/posts-output/2026-07-15-Everyone-dies-UK/)
3. [Extreme Heat](https://www.journeyman.cc/blog/posts-output/2026-07-31-Extreme-Heat/)
4. [Analysis of 2026 heatwaves UK](https://www.journeyman.cc/blog/posts-output/2026-08-04-Analysis-of-2026-heatwaves-UK/)
5. [Exploration of what happened on 26th June this year](https://www.journeyman.cc/blog/posts-output/2026-08-13-Exploration-of-what-happened-on-26th-June-this-year/)
## Status
## Disclaimer
Alpha-quality code. It more or less works but it isn't at all polished.
This library is supplied in the hope that it may be useful, but results computed with it should not be taken as authoritative but should be checked against other sources. I do not have enough expertise to guarantee its results are correct.
## General architecture
@ -29,13 +30,13 @@ for some of the following keywords:
1. `:dew-point-celsius`
2. `:pressure-pascals`
3. `:pressure-millibars`
4. `:saturation-vapour-pressure` *Pascals*
5. `:relative-humidity` *percentage, 0...100.*
4. `:relative-humidity` *percentage, 0...100.*
5. `:saturation-vapour-pressure` *Pascals*
6. `:temperature` *assumed to be ° Celsius*
7. `:temperature-celsius`
8. `:temperature-kelvin`
9. `:volume` *in metres<sup>3</sup>, relative to 1 at standard temperature and pressure.*
10. `:wet-bulb-temperature` *in &deg; Celsius.*
10. `:wet-bulb-temperature-celsius` *in &deg; Celsius.*
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
@ -52,9 +53,58 @@ humidity.core=> (resolution :relative-humidity 100 :temperature-celsius 35)
{:relative-humidity 100, :temperature-celsius 35, :pressure-pascals 101325, :pressure-millibars 4053/4, :saturation-vapour-pressure 5622.488734516426, :temperature-kelvin 308.15, :absolute-humidity 3953.618101887827}
```
At present there are no checks to ensure that the packet makes sense.
### Naming
Associated with each variable there is a namespace which contains a function that takes a packet, and, provided that packet contains enough information to compute that variable, returns a numeric value, else `nil`.
Associated with each variable there is a namespace of the same name which contains a function, whose name is the name of the variable with `-fn` appended, that takes a packet, and, provided that packet contains enough information to compute that variable, returns a numeric value, else `nil`.
### Validation
A packet may be validated by calling the function `validate`. This recalculates all values in the packet, and, by default, tolerates discrepancies of up to 1%. This tolerance can be varied by binding the dynamic variable `*validation-limit*`. Validation merely checks that the values within the packet are consistent with one another, and does not properly account for pressure, so will not be valid at altitude.
```clojure
humidity.core=> (validate {:absolute-humidity 3953.618101887827,
#_=> :actual-vapour-pressure 4765.10094206357,
#_=> :dew-point-celsius 35.00000000000001,
#_=> :pressure-millibars 1013.25,
#_=> :pressure-pascals 101325,
#_=> :relative-humidity 100,
#_=> :saturation-vapour-pressure 5622.488734516426,
#_=> :temperature-celsius 35,
#_=> :temperature-kelvin 308.15,
#_=> :volume 1.1281347245103424,
#_=> :wet-bulb-temperature-celsius 35.11625928298915}
#_=> )
true
humidity.core=> (validate {:absolute-humidity 3953.618101887827,
#_=> :actual-vapour-pressure 4765.10094206357,
#_=> :dew-point-celsius 35.00000000000001,
#_=> :pressure-millibars 1013.25,
#_=> :pressure-pascals 101325,
#_=> :relative-humidity 95, ;; <-- intentionally wrong
#_=> :saturation-vapour-pressure 5622.488734516426,
#_=> :temperature-celsius 35,
#_=> :temperature-kelvin 308.15,
#_=> :volume 1.1281347245103424,
#_=> :wet-bulb-temperature-celsius 35.11625928298915}
#_=> )
ERROR: key: :dew-point-celsius; a: 35.00000000000001; b 34.07737599732603; errror: 2.857142925262451%.
false
humidity.core=> (binding [*validation-limit* 5]
#_=> (validate {:absolute-humidity 3953.618101887827,
#_=> :actual-vapour-pressure 4765.10094206357,
#_=> :dew-point-celsius 35.00000000000001,
#_=> :pressure-millibars 1013.25,
#_=> :pressure-pascals 101325,
#_=> :relative-humidity 95, ;; <-- intentionally wrong
#_=> :saturation-vapour-pressure 5622.488734516426,
#_=> :temperature-celsius 35,
#_=> :temperature-kelvin 308.15,
#_=> :volume 1.1281347245103424,
#_=> :wet-bulb-temperature-celsius 35.11625928298915}))
true
```
## Developing
@ -66,6 +116,8 @@ lein repl
and hook in your preferred editor as appropriate for that editor.
Full documentation is available [here](https://www.journeyman.cc/humidity).
## Testing
Tests are reasonably complets but all could do with more examples, especially around the crucial 35&deg; C wet bulb area and towards the extremities of normal weather range. If you are contributing additional code, I would appreciate it being accompanied by tests.