Questions tagged [water]
Two Hydrogen atoms covalently bonded to one Oxygen atom. One of the more common compounds on the surface of the earth.
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Albedo of water vs temperature
This question arose out of pure curiosity.
Is there a relation between the temperature of water and its albedo? Would the albedo increase if I increased temperature? Say I measure albedo by directing ...
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Temperature of a resting glass of water
It’s summer and summers have become more and more hot&humid lately. This got me curious about the dew point and then wet bulb temperatures, both for scientific and (maybe, someday in the future) ...
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Chemistry of electrical conductivity of pure water
I understand the electrical conductivity of pure water is very low, but not zero, and is due to the slight number of H+ and OH- ions naturally present. I understand that they will move under the ...
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How does an ultrasonic humidifier / atomizer affect temperature?
Evaporative cooling is a technique used to cool air by using the evaporation of a liquid.
My google research on evaporative cooling shows a ubiquitous concept of forcing air through a pad/membrane/...
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Why won't there be any transfer of heat energy when ice at 0°C is in contact with water at 0°C in a closed container?
In my book, Concise Physics of Selina Publications for Class IX, it's written there that "If there is no transfer of heat between the two bodies placed in contact, they are said to be at the same ...
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Pressure build inside water tank [closed]
It‘s been a few years since I had my last physics class so please be kind to me. I came here to ask you about a phenomenon I recently discovered in a design of mine.
The object in question is a stand ...
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Can siphons improve the efficiency of hydroelectric dams?
Suppose we have built a hydroelectric dam where the water inlet is 100m above the outlet. We can now use the gravitational potential of the water to spin a turbine. However, suppose we install a ...
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Measuring real time water usage with live water pressure monitoring
My home started seeing high water bills recently. My water company doesn't provide live water meter readings. There is a water meter on the street which I can monitor while water is being used but I ...
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Why doesn't ice in a glacier feel as cold when I touch it as the ice I get from my freezer?
When I was in Iceland, I went to a tour in a glacier and I remember the ice that was there. It looked and felt like a huge amorphous block of glass: hard, smooth, not wet, and not that cold.
Not as ...
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Why would water rise if the height of the capillary tube above the water surface is decreased?
While studying fluid mechanics I came across a section which say:
If a tube is submerged in water and some part is empty
Water rises in a capillary tube say to height $ h$ .Now changing the length ...
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Is the velocity in parallel pipes the same as a single pipe according to Bernoulli's equation?
This system pushes water through a nozzle. I can use Modified Bernoulli's equation to calculate the nozzle velocity as such:
$$V_3 = \sqrt{2g\left(\frac{P_1}{\rho g}+ z_1-\Delta h_L\right)}$$
where ($\...
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Energy Benefits of Using Windows Vacuums to Remove Water That Otherwise Evaporates and Absorbs Energy
I've been using a new window vac and pondering its effect on the temperature in the house - and there seems nothing written about this that I can find. Plainly when the water evaporates energy is ...
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Optimal temperature for Mpemba effect
Is there an optimal temperature for the Mpemba effect? If so, what is it?
If a specific example is needed: There is a 100 milliliter sphere of water floating in air at -10 °C. At what initial ...
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At what temperature does flowing water start to freeze?
We know that flowing water remains liquid even in the below-zero temperatures (a good example is rivers in arctic regions). Of course water doesn't remain liquid forever if temperature goes down ...
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Under water light reflection of air in a cup vs water in a cup
The last time I was on vacation I was drinking on the swimming pool, and after I was finished with the drinks I started playing with the 2 plastic cups I had, and noticed that the air produces a ...
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