3 ms·
In structural engineering, strain is a unitless quantity (length expansion per unit length) and in my aerospace job we would express parts per million of strain
by SilasX 5y ago
In structural engineering, strain is a unitless quantity (length expansion per unit length) and in my aerospace job we would express parts per million of strain as microstrain.
(I expressed my pitiful raise as 20000 microstrain.)
- navane 5y agoSometimes we keep the units though, and express strain in mm/mm. "The strain limit for S355 is about 0.02 mm/mm." A mathematician might eliminate them against each other, for a phycisist it's a reminder of what its definition.
- SilasX 5y agoGood point. I also really shouldn’t say strain is unitless, just a case where the units happen to divide out.