Heat concentrated causing rapid boiling in isolated spot.
Scrape the contents off the bottom and stir to make everything as homogeneous in suspension as possible to avoid this
Something similar happened when I was a kid trying to heat soup in the microwave. I heard a loud pop and the microwave shut itself off. The soup looked like it had exploded out of its container and coated the inside of the microwave
It's getting really really hot at the bottom but the rest of the liquid hasn't reached boiling temp. I bet if you took the pot off the fire and touched the bottom of it, you'd see what I mean. Don't do that however, obviously lol
70°C is equivalent to 158°F, which is 343K.
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My guess is the high heat of the fire is causing tiny pockets of liquid to boil instantaneously at the interface between the bottom of your coffee pot and the coffee liquid.
Yep. It's hot enough to boil on the bottom but not in the liquid above. The sound is the steam bubbles collapsing back to a liquid as they rise into the cooler zone. In pumps there's a similar phenomenon called cavitation, which sounds like pumping gravel.
So I'm pretty sure that is not how heat transfer works. I just finished my second thermodynamics class and none of the water will boil until after reaching a certain temperature. What I'm seeing is that the metal container is getting heated and changing its shape, that ping noise, with that change in shape energy is transfering through the water and you see it.
This is actually an interesting fenomenon. The main ingredient by volume of coffee is water. At 1 bar and 100 degrees celcius water shifts from a liquid to a gas. Since the change happens from the bottom, and the gas is less dens than the surrounding liquid water, it will rise up and the result is tiny bubbles escaping the coffee. This is usually referred to as boiling.
I made cofee with cofee grounds. After a while I wanted to reheat it, and these plopping sounds come as soon as I put it over the fire, almost sounds like popcorn. Are these the coffee grounds on the bottom? Can't think of anything else.
EDIT: It's not boiling; the coffee was lukewarm and this happened as soon as I put it on the fire. I could still put my finger in it.
Titanium is a good heat conductor and has low thermos capacity. So a lot of the heat goes direct to the coffee and the water at the bottom. If the grounds aren’t able to freely move then maybe you’re getting small pockets of boiling water or any left over gas from the coffee grounds. Depending on how fresh the grounds are they can off gas C02 from the roasting process.
That was probably it, thanks. They might have stuck to the bottom, although I just threw them in without stirring since the boiling takes care of that. Never saw this! The coffee sat off the fire for about 10 minutes probably before putting it back on.
The water under the cup is trapped until it boils then it escapes (due to expansion) which slightly raises the cup up then as water rushes in the cup drops down making a noise
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Heat concentrated causing rapid boiling in isolated spot. Scrape the contents off the bottom and stir to make everything as homogeneous in suspension as possible to avoid this
When I was a chemist, we called it bumping. If you let it go long enough, it can build enough force to knock over the pot.
Something similar happened when I was a kid trying to heat soup in the microwave. I heard a loud pop and the microwave shut itself off. The soup looked like it had exploded out of its container and coated the inside of the microwave
I'll try that next time. It surprised me as the coffee was lukewarm here and I could easily put my finger in the coffee.
This is correct answer. The reason why it’s lukewarm is because the heat is dissipated in the surrounding colder water.
That would be the heat
It's not boiling; the coffee was lukewarm and this happened as soon as I put it on the fire. I could still put my finger in it.
I'm just kidding around, that is a crazy sound. I bet you're probably right about the coffee grounds. Or the expansion of the metal is pinging
It's starting to boil? Lol
It's not boiling; the coffee was lukewarm and this happened as soon as I put it on the fire. I could still put my finger in it.
It's getting really really hot at the bottom but the rest of the liquid hasn't reached boiling temp. I bet if you took the pot off the fire and touched the bottom of it, you'd see what I mean. Don't do that however, obviously lol
Are you sure you're not in the Everest summit? There your coffee would boil around 70°C.
Well I wouldn't really call 70°C lukewarm, but yes I'm sure I'm at no higher than 10m over sea level haha
70°C is equivalent to 158°F, which is 343K. --- ^(I'm a bot that converts temperature between two units humans can understand, then convert it to Kelvin for bots and physicists to understand)
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Good bot.
Good human.
Agreed, most tauntauns have body temperature much lower than that
T-Rex walking by. Don't. Move.
It cant see us if we dont move
It’s boiling my man
It's not boiling; the coffee was lukewarm and this happened as soon as I put it on the fire. I could still put my finger in it.
My guess is the high heat of the fire is causing tiny pockets of liquid to boil instantaneously at the interface between the bottom of your coffee pot and the coffee liquid.
That seems to be the case, thanks.
Yep. It's hot enough to boil on the bottom but not in the liquid above. The sound is the steam bubbles collapsing back to a liquid as they rise into the cooler zone. In pumps there's a similar phenomenon called cavitation, which sounds like pumping gravel.
So I'm pretty sure that is not how heat transfer works. I just finished my second thermodynamics class and none of the water will boil until after reaching a certain temperature. What I'm seeing is that the metal container is getting heated and changing its shape, that ping noise, with that change in shape energy is transfering through the water and you see it.
Evaporation?
Has anyone said “t Rex” yet? Are jokes allowed?
Haha you're the second one!
The Fire
This is actually an interesting fenomenon. The main ingredient by volume of coffee is water. At 1 bar and 100 degrees celcius water shifts from a liquid to a gas. Since the change happens from the bottom, and the gas is less dens than the surrounding liquid water, it will rise up and the result is tiny bubbles escaping the coffee. This is usually referred to as boiling.
I made cofee with cofee grounds. After a while I wanted to reheat it, and these plopping sounds come as soon as I put it over the fire, almost sounds like popcorn. Are these the coffee grounds on the bottom? Can't think of anything else. EDIT: It's not boiling; the coffee was lukewarm and this happened as soon as I put it on the fire. I could still put my finger in it.
Titanium pot?
Yup
Titanium is a good heat conductor and has low thermos capacity. So a lot of the heat goes direct to the coffee and the water at the bottom. If the grounds aren’t able to freely move then maybe you’re getting small pockets of boiling water or any left over gas from the coffee grounds. Depending on how fresh the grounds are they can off gas C02 from the roasting process.
That was probably it, thanks. They might have stuck to the bottom, although I just threw them in without stirring since the boiling takes care of that. Never saw this! The coffee sat off the fire for about 10 minutes probably before putting it back on.
When water is heated past 212 degrees it will begin what is known as boiling. Pretty cool stuff, look it up
It's not boiling; the coffee was lukewarm and this happened as soon as I put it on the fire. I could still put my finger in it.
The water under the cup is trapped until it boils then it escapes (due to expansion) which slightly raises the cup up then as water rushes in the cup drops down making a noise
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Stir it.