5 ms·
So this sent me down the wikipedia rabbit hole :D One thing I never realised is how dramatically the viscosity of water changes with temperature. This is proba
by dandare 5y ago
So this sent me down the wikipedia rabbit hole :D
One thing I never realised is how dramatically the viscosity of water changes with temperature. This is probably why you can recognise hot water from a cold water in a video.
Temperature (C) / Viscosity (mPa*s)
0.01 1.7911
10 1.3059
20 1.0016
25 0.89002
30 0.79722
40 0.65273
50 0.54652
60 0.46603
70 0.40355
80 0.35405
90 0.31417
99.606 0.28275
- steerablesafe 5y agoI had the pleasure to measure that in a university lab, it's very apparent when measuring near 0°C takes roughly 2x longer than on room temp.
- deleted 5y ago[deleted]
- KineticLensman 5y agoI've sometimes thought that the sound of water in my shower changes as the water reaches max temperature. Perhaps that's why?
- ThrustVectoring 5y agoI was always able to tell as a kid in my childhood home, likely plumbing-system dependent.
- pfdietz 5y agoI wonder how pressure affects that, particularly near boiling. EDIT: https://www.nature.com/articles/2151053a0 https://www.nature.com/articles/2151053a0
- HPsquared 5y agoAnother interesting temperature dependence of water is the negative thermal expansion between 0°C and +4°C. The maximum density is at +4°C. Therefore, between 0 and 4°C the usual law of natural convection (heat rises) is inverted and you get "heat falls" instead. What this means is that in winter, the ice on top of water can be frozen but the water can be warmer further down and resist further heat transfer. Natural convection will not act to cool the water from above, and a stable stratified temperature gradient can form. This allows bodies of water to remain liquid in winter for longer than you'd expect in a "normal" liquid.