In our Inbox:
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@NO_KINGS_muc Sadly Lava has a specific heat capacity of <1kJ/kgK, while Ice has slightly above 2kJ/kgK, a specific melting energy of 334kJ/kg, Water then has a specific heat capacity of over 4kJ/kgK, and a specific vapourizing energy of about 2200kJ/kg.
Since hot lava is not just going to melt ice on contact, but vapourize the water: Suppose you've got 1kg of 1200°C lava. This thus has an energy of less than 1500kJ.
Suppose you've got ice at -20°C. Then for each kg of ice you'll need over 20*2+334=374kJ to melt. So theoretically we could melt 3–4kg of ice. But since until say 200°C the molten water is going to evaporate pretty fast this means for ~1000kJ you need to also heat the water to 100°C (420kJ/kg) and vapourize it (2.2MJ/kg).
So all in all you'd have ~3MJ/kg of ice. So this 1000kJ can evaporate only ⅓kg of ice. The remainig 200kJ to 0°C will maybe rather melt the ice, but at this point you have only energy for melting a bit more than ½kg of ice. So all in all 1kg of 1200°C lava will only melt ~1kg of ice at -20°C.
So don't think this would be overly effective.
@lazy Nevertheless, I'd be willing to back experiments to see what actuallly happens if we bring hot lava into contact with ICE.
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@lazy @NO_KINGS_muc
So as long as LAVA outnumber ICE by more than 2:1, victory for LAVA ??No problem!
( my brain isnt quite right ATM so I might have read that totally wrong!)
@OliverNoble Looks like it might require at least 3:1, though I admit I'm not mathing well today. Still, I think we have those numbers, easily.
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In our Inbox:
My 13-year-old son just said, “Mum, I think I have a good idea. The people in America protesting ICE should call themselves LAVA — Local And Very Angry. And lava melts ice. You should post that and see if it's a good idea"
We’re about as far away from the United States as you can get, here in Perth, Western Australia. But I hope the people over there know that even a young boy on the other side of the world can see when something isn’t right.
Emily, Perth
@NO_KINGS_muc I'm into it.
🧊
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@OliverNoble Looks like it might require at least 3:1, though I admit I'm not mathing well today. Still, I think we have those numbers, easily.
@wesdym
But are we counting by weight or by volume? (And I think it's a Great slogan, it's a political statement, not high school physics coursework)
@OliverNoble -
@wesdym
But are we counting by weight or by volume? (And I think it's a Great slogan, it's a political statement, not high school physics coursework)
@OliverNoble@notsoloud Mass. If 1 kg lava vaporizes 1/3 kg of ice, then you need 3 kg lava to vaporize 1 kg ice.
But that's doable. Decent people vastly out-number these assholes.
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In our Inbox:
My 13-year-old son just said, “Mum, I think I have a good idea. The people in America protesting ICE should call themselves LAVA — Local And Very Angry. And lava melts ice. You should post that and see if it's a good idea"
We’re about as far away from the United States as you can get, here in Perth, Western Australia. But I hope the people over there know that even a young boy on the other side of the world can see when something isn’t right.
Emily, Perth
@NO_KINGS_muc @JugglingWithEggs What a clever lad he is!
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In our Inbox:
My 13-year-old son just said, “Mum, I think I have a good idea. The people in America protesting ICE should call themselves LAVA — Local And Very Angry. And lava melts ice. You should post that and see if it's a good idea"
We’re about as far away from the United States as you can get, here in Perth, Western Australia. But I hope the people over there know that even a young boy on the other side of the world can see when something isn’t right.
Emily, Perth
@NO_KINGS_muc Please tell your son that it is an AMAZING idea, and thank you to both of you!
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@NO_KINGS_muc Sadly Lava has a specific heat capacity of <1kJ/kgK, while Ice has slightly above 2kJ/kgK, a specific melting energy of 334kJ/kg, Water then has a specific heat capacity of over 4kJ/kgK, and a specific vapourizing energy of about 2200kJ/kg.
Since hot lava is not just going to melt ice on contact, but vapourize the water: Suppose you've got 1kg of 1200°C lava. This thus has an energy of less than 1500kJ.
Suppose you've got ice at -20°C. Then for each kg of ice you'll need over 20*2+334=374kJ to melt. So theoretically we could melt 3–4kg of ice. But since until say 200°C the molten water is going to evaporate pretty fast this means for ~1000kJ you need to also heat the water to 100°C (420kJ/kg) and vapourize it (2.2MJ/kg).
So all in all you'd have ~3MJ/kg of ice. So this 1000kJ can evaporate only ⅓kg of ice. The remainig 200kJ to 0°C will maybe rather melt the ice, but at this point you have only energy for melting a bit more than ½kg of ice. So all in all 1kg of 1200°C lava will only melt ~1kg of ice at -20°C.
So don't think this would be overly effective.
@lazy
@NO_KINGS_muc
Good thing that there is like 100 times more LAVA than ICE.LAVA does not fight alone. Once the vulcano erupts, LAVA will reform the very land!
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@lazy
@NO_KINGS_muc
Good thing that there is like 100 times more LAVA than ICE.LAVA does not fight alone. Once the vulcano erupts, LAVA will reform the very land!
@blackoverflow @NO_KINGS_muc Yes, and it might also prove that ICE is less cool than they think they are!
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In our Inbox:
My 13-year-old son just said, “Mum, I think I have a good idea. The people in America protesting ICE should call themselves LAVA — Local And Very Angry. And lava melts ice. You should post that and see if it's a good idea"
We’re about as far away from the United States as you can get, here in Perth, Western Australia. But I hope the people over there know that even a young boy on the other side of the world can see when something isn’t right.
Emily, Perth
@NO_KINGS_muc @noondlyt Team #lava!
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In our Inbox:
My 13-year-old son just said, “Mum, I think I have a good idea. The people in America protesting ICE should call themselves LAVA — Local And Very Angry. And lava melts ice. You should post that and see if it's a good idea"
We’re about as far away from the United States as you can get, here in Perth, Western Australia. But I hope the people over there know that even a young boy on the other side of the world can see when something isn’t right.
Emily, Perth
@NO_KINGS_muc No shit bro that's actually a great idea
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@NO_KINGS_muc Sadly Lava has a specific heat capacity of <1kJ/kgK, while Ice has slightly above 2kJ/kgK, a specific melting energy of 334kJ/kg, Water then has a specific heat capacity of over 4kJ/kgK, and a specific vapourizing energy of about 2200kJ/kg.
Since hot lava is not just going to melt ice on contact, but vapourize the water: Suppose you've got 1kg of 1200°C lava. This thus has an energy of less than 1500kJ.
Suppose you've got ice at -20°C. Then for each kg of ice you'll need over 20*2+334=374kJ to melt. So theoretically we could melt 3–4kg of ice. But since until say 200°C the molten water is going to evaporate pretty fast this means for ~1000kJ you need to also heat the water to 100°C (420kJ/kg) and vapourize it (2.2MJ/kg).
So all in all you'd have ~3MJ/kg of ice. So this 1000kJ can evaporate only ⅓kg of ice. The remainig 200kJ to 0°C will maybe rather melt the ice, but at this point you have only energy for melting a bit more than ½kg of ice. So all in all 1kg of 1200°C lava will only melt ~1kg of ice at -20°C.
So don't think this would be overly effective.
@lazy @NO_KINGS_muc this may be the most Mastodon reply ever.
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We had a missinformation, sorry!
The LAVA quote comes from Kaylie Morphew (threads.com/@kaylie.morphew)@NO_KINGS_muc
Thanks! So great seeing self-correction posts on social media! #honesty #humility #integrity -
A anderslund@expressional.social shared this topic
