Its to do with the amount of sugar that can dissolve in water at atmospheric pressure. The only way to get the 2kg:1L into solution is to raise the pressure with a pressure cooker
NO.
Wrong on facts and understanding.
As explained previously, pressure,
on its own, has almost nothing to do with solubility of solids in liquids.
Pressure does allow a higher maximum liquid temperature before the limit that boiling sets.
Thus, under pressure one can achieve a higher (boiling) temperature, at which the solubility of sucrose is higher.
But you DON'T need extra pressure to get 2kg to dissolve in 1 litre of water, because you DON'T need to raise the temperature above 100C.
That much will dissolve readily in well stirred, gently warm water, say about 45C.
But there's no point, as its not a good idea.
Because, once the temperature is lowered, excess will be dropped out of solution.
At a temperature of about 20C, 2kg of sugar is the very maximum of sucrose (white sugar) that 1 litre of water can hold. Any more sugar than 2kg dissolved in at a higher temperature will come out on cooling back to 20C, and cooling below 20C (like outdoors in Autumn) will drop still more solids out of solution.
Last Friday, I was arguing at DEFRA that beekeepers were
not too stupid to be let loose with Oxalic Acid vaporisers. DEFRA's position is that one must set the laws so that even the stupidest will still be safe and not a danger to others.
I really hope nobody shows them this thread.
