Is hott water thinner than cold water?

Question

I noticed on my water dispencer that the cold water comes out slower and hot faster.

Answer 1

Less dense, yes. Less viscous, too, good eye. Viscosity is nearly halved between 20 ºC and 50 ºC.

ºC _ viscosity (Pa·s)

10 _ 1.308 × 10−3

20 _ 1.003 × 10−3

30 _ 0.7978 × 10−3

40 _ 0.6531 × 10−3

50 _ 0.5471 × 10−3

60 _ 0.4668 × 10−3

70 _ 0.4044 × 10−3

80 _ 0.3550 × 10−3

90 _ 0.3150 × 10−3

100 _ 0.2822 × 10−3

Answer 2

hot water is less dense than cold water.... if you want to play scientist try this:

Take two bottles.. fill on with cold water and one with warm. stick a piece or plastic or something thin like that on the top of the cold one, then put food coloring in the warm one. flip the warm bottle over and put it ontop of the cold one and then remove the plastic. the water doesnt combine! but if you put the food coloring in the cold and put the cold ontop, it does! this shows density!

Answer 3

yeah

Answer 4

What you noticed was a change in the viscosity of water, as noted in the first answer. Viscosity refers to a substance's resistance to change shape, also interpreted as how easily it flows. For example, maple syrup has a higher viscosity than water, which in turn has a higher viscosity than air. As water gets colder, it's viscosity increases.

Another interpretation of "thinner" is the density of water. Density refers to the mass contained within a certain volume. Generally, you will hear that the density of water is 1 gram per milliliter (or one gram per cubic centimeter.) But, this is just an estimation. The density of water actually is highest at 4° Celsius and decreases the further you get from that mark. An absurdly complicated chart showing this can be found at:

http://www.simetric.co.uk/si_water.htm

Answer 5

Does water freeze or not