They used to determine elevations by boiling water.
Feet, Meters, F, C
0 0 212.0 100.0
250 76 211.5 99.7
500 152 211.0 99.5
750 229 210.5 99.2
1000 305 210.1 98.9
1250 381 209.6 98.6
1500 457 209.1 98.4
1750 533 208.6 98.1
2000 610 208.1 97.8
2250 686 207.6 97.6
2500 762 207.2 97.3
2750 838 206.7 97.1
3000 914 206.2 96.8
3250 991 205.7 96.5
3500 1067 205.3 96.3
3750 1143 204.8 96.0
4000 1219 204.3 95.7
With a very accurate thermometer and then averaging readings over a month or
year, you could nail your elevation.
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