https://morsecode.world/international/translator.html
Don’t ware it out
.-.. . ... ... / .. ... / -- --- .-. .
Only Smore code. Tasty, but nobody knew wotnahell I was saying.
That’s what you get for talking with your mouth full.
[quote=Kevin Z] <p>.-.. . ... ... / .. ... / -- --- .-. .</p> [/quote]
-- --- .-. . / --- .-. / .-.. . ... ...
Thermodynamics trivia question: Why is it that when a pot of water reaches the boiling point, the entire pot of water, boiling vigorously, does not immediately flash to steam at once?
Why, when the pot of water is boiling for the amount of time that it takes to all boil to steam, a thermometer in the water stays at 212 degrees Fahrenheit, without rising above that temperature, during the time that heat from the flame is going into the boiling water?
1: The energy is being released in steam, and its not going in fast enough, if you were to basically explode the water putting all the energy in at once, it would
2: Gas doesn’t transfer heat as well, also if the steam is coming off the water it might only be 213 degrees, not much higher than 212
At least I think
Latent heat.
An amount of liquid water at 100 C ==> Same amount of water vapor at 100C
There is a heat source; a power input into the liquid water for a certain amount of time for all the liquid water to have turned into water vapor. The product of power and time is the amount of total energy that went into the liquid water to turn completely into water vapor, while the temperature remains 100 C. This is called latent heat (energy).
The amount of energy to heat up 1kg of water is 4.19kJ/degr.C
The amount of energy to evaporate 1 kg of water is 2,256kJ.
At home it takes about 4 minutes to make the water for my eggs boil (from 15degr.C to 100degr.C).
That requires circa: 85degr.C * 4.19kJ/degr.C.kg = 356kJ.
Apply more heat and the water starts to evaporate (boiling point of 100degr.C is the end of the line for water)
It takes about 25 minutes to evaporate that water into steam (give or take a ballpark).
Only when that has happened the temperature in a pot without water will rise (fast).
Changing the phase of a material (ice=>melting=>water) and (water=>evaporating=>steam)
costs much more energy than raising the temperature 1 degree.
Yes, correct! Latent heat of phase change. The latent heat of vaporization for water is huge, compared to the sensible heat. The stove flame is not able to provide the required heat to change a pot of water to steam all at once.
When the pot of water is boiling for a period of time at 212 degrees, all of the heat from the stove going into the water is being used to change the phase of the water from liquid to water. That is why a steam burn at 212 degrees is worse than a water burn at 212 degrees, the steam at the same temperature contains much more heat.
Latent heat of condensation is one factor in why a clear winter night has lower dry bulb temperatures than a rainy or snowy winter night. When water vapor in the clouds turns to liquid or solid, lots of heat is released.