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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 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!
NO KINGS München
Tina
Blackoverflow