if given enough heat will diamond melt into liquid like glass why or why not ?
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Diamond is one form of carbon. And it is metastable at room temperature and pressure. Which means it “shouldn’t exist” (rather, it can’t form by itself, and would “fall apart” – turn into graphite, another form of carbom, if it could). If you just heat it up it will turn into graphite. Rather, it would, but if you heat it up in air, it’ll burn, turn into carbon dioxide, and nothing will be left.
And you can’t really get liquid “diamond”. You can melt it but it will be indistinguishable from molten graphite. But to get liquid carbon, you need to heat it up under a lot of pressure. And it can’t be in pressurised air, because it will burn. It can’t be under pure nitrogen either, carbon reacts with it as well. What you need is at least around 5000K and 100 atmosperes to have liquid carbon. And I’m not sure how you would achieve that practically.
Every element has three states of matter, solid liquid and gas, given certain temperatures and pressures.
IRON will have a boiling —> gas point. Oxygen has a freezing solid point.
Obviously this is true of simple molecules like water (two hydrogens and an oxygen) buuut I am uncertain about all the other molecules as well…
Could be actually create so much pressure outside of a black hole…etc?
I mean we can’t even have probes survive on Venus’s surface and it’s pressure is only 93 bar temperature is only 737°K.
I know you can’t cut ferrous materials with a diamond grinding disc, because the diamonds will melt.
There is a really great explanation already, but I’d just remind you to look at dry ice.
There is no liquid phase for carbon at low pressure, such as in Earth’s atmosphere. Giving it a crystalline structure wouldn’t change that at all.
You could think of a perfect diamond as extremely pure coal. It would give off heat and carbon dioxide.
There’s a NileRed vid on Youtube where he heats diamonds in a high oxygen environment to produce CO2. He then uses the CO2 to carbonate water and make soda, which he goes on to drink
First, it is extremely important to understand that the system needs to be closed to other substances or the carbon will almost certainly react (make a new compound). If heated in open air, diamond will react with oxygen (or “burn”) and (eventually) make CO2 rather than carbon liquid, as one example of the problem.
Diamond is what we call “metastable”. This means that another form of the substance (chemical compound) is chemically stable at the conditions but the less stable version (diamond, here) simply lacks enough energy to convert to that other more stable form, so it doesn’t change, even though nature would like it to do so. Lots of chemical compounds in our reality fit that. They persist in the form they were created instead of changing into the form that should exist for the “New” conditions. Glass itself is actually such a material.
If you heat diamond enough, it will usually recrystallize into graphitic carbon before it converts into gas or liquid (heating provides the needed energy to convert to the more stable graphite form of carbon). Graphitic carbon when heated will convert directly into gas if pressures are not raised (will not melt, will not make liquid). This conversion of solid to gas directly is called sublimation. Many substances do that, like dry ice (frozen CO2) for example.
It might be possible to convert diamond directly into carbon gas if you heat it fast enough (make it turn into gas faster than it converts into graphite), but some of the diamond will still change into graphite before turning into gas. Just a question of how much, not if.
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