Here’s the explanation for those of y’all too lazy to click and/or don’t have FB
A bit of science.
I've got several comments regarding the fact that the videos I posted these days must be fake. Someone thinks the videos are sped up (I never speed up videos, unless specifically stated), some others claim that it's fake because the snow doesn't produce steam when touched by the lava.
Here I try to explain why the latter phenomenon happens.
In the abstract of a paper published in 1984 by A. A. Mills called "Pillow lavas and the Leidenfrost effect" is stated: "This is made possible by the Leidenfrost effect, the phenomenon whereby film boiling replaces the usual nucleated boiling above a certain temperature, thereby forming an insulating sheath of vapour around any sufficiently hot body immersed in a liquid. Only on cooling below a certain temperature (defined as the Nukiyama temperature) will rapid heat exchange occur between water and hot, gas-free lava."
This applies in the situation shown in the video. In easy words, when the water, or the snow in this case, is touched by a superheated surface (the lava) it forms a very thin layer of steam which protects the snow. It would take a bit longer, and a bit of cooling, to start producing plumes (nucleated boiling). Since lava moves fast, it covers the snow before that can happen.
Regarding the speed, that's the actual speed of Thursday's lava flow. I have no need to speed it up for whatever reason. Basaltic lava, with that low content of silica and temperature over 1100°C, moves fast, even on a quasi-flat surface.
So, before you waste your time vomiting your statements under some content, use it to study a bit of lava rheology or thermodynamics. Then we can have a constructive discussion.
One thing is for sure, from me, you will never get fake videos or composite footage. That's not my style, and I have no need to change that.
© Marco Di Marco/Volcano Chaser
• 08.02.2024
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