4 ms·
don't they still use pounds per square inch ? Now, in Europe (excluding the UK) they also still use some weird units from the past. Calories for example, and h
by toolslive 7y ago
don't they still use pounds per square inch ?
Now, in Europe (excluding the UK) they also still use some weird units from the past. Calories for example, and horse (!!) power.
- ghaff 7y agoPSI is very commonplace though I'm not in a field where I use it in an engineering way. (I actually had to think for a second to come up with the SI equivalent.) Pounds are one of the real bugbears of imperial in mechanical engineering with lb-f and slugs (i.e. "pounds" conflates mass and weight). Always hated that. I'd convert things to metric and then convert back when I had to work in Imperial. And I still hear stones from time to time in the UK if you really want archaic.
- Accacin 7y agoYeah, a lot of people in the UK use stones for weight. Even young people in my experience.
- pbhjpbhj 7y agoWe still use PSI for tyre pressures in UK, probably some other things too. They're given in N/m^2, but all the petrol station machines are in PSI, probably because the numbers just fall better.
- ghaff 7y agoA calorie was originally defined as as the amount of heat required at a pressure of 1 standard atmosphere to raise the temperature of 1 gram of water 1° Celsius. But you're right that is sort of a weird unit from the past insofar as it's related to the SI system but isn't formally part of it. (It's basically now defined by its ratio to joules.)
- ghaff 7y agoAdding: There are a number of measurements that aren't necessarily obviously related but are actually the same thing in terms of units. Heat, work, and energy are all newton meters or kg m^2/sec^2 in SI units.