Airgead
Ohhh... I can write anything I like here
- Joined
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The reason people still prefer to give heights in feet and inches is all to do with the way our brains process information. Essentially we are bad at visualising fractions smaller than a quarter and we are bad at visualising large numbers of things.
So I can give my height as six foot three and a smidge. Visualising six units of a foot is a pretty easy task then adding three units of an inch is easy as well so its an easy measurement to visualise. On the other hand I can give my height at 191cm but now you have to visualise 191 of something to get an idea of how big that is which is hard. Or I can say 1.91m which is a smaller number but now I have to visualise 9/10 of something which is hard. Or I caould say 1m and 91 cm. The 1m is easy but now I'm back to having to visualise 91 of something...
Calling it in decimetres (10cm) could work - I'm 19 decimetres and 1cm. 19 isn't too bad to visualise but it still harder than 6. Cognitively you don't really want to go over 7-9 for visualisation. What we really need is some unit that brings the height of an average human down to less than 9 units. Something around 30cm works well as most people are between 4 and 7 of them. That of course is the foot...
The metric system is great for calculation but it sucks the big one for visualising lengths.
So I can give my height as six foot three and a smidge. Visualising six units of a foot is a pretty easy task then adding three units of an inch is easy as well so its an easy measurement to visualise. On the other hand I can give my height at 191cm but now you have to visualise 191 of something to get an idea of how big that is which is hard. Or I can say 1.91m which is a smaller number but now I have to visualise 9/10 of something which is hard. Or I caould say 1m and 91 cm. The 1m is easy but now I'm back to having to visualise 91 of something...
Calling it in decimetres (10cm) could work - I'm 19 decimetres and 1cm. 19 isn't too bad to visualise but it still harder than 6. Cognitively you don't really want to go over 7-9 for visualisation. What we really need is some unit that brings the height of an average human down to less than 9 units. Something around 30cm works well as most people are between 4 and 7 of them. That of course is the foot...
The metric system is great for calculation but it sucks the big one for visualising lengths.