It is a very good concern. Safe use of the evaporation function comes from:
Good ventilation (open a window or ventilation duct nearby)
Slow evaporation by the POT by NOIDS (50ml/hour)
The inflammable gas from ethanol needs to meet 2 criteria to burn/combust:
The gas percentage in the air needs to meet the flammability limits (3.3% to 19%).
There is a spark/flame in the gas-air mixture.
The max volume of ethanol that can be evaporated in POT is 250ml (197.25 gram/4.29 mol/0.096 CBM). In order to let the 0.096 CBM of ethanol gas combust, it needs to be evaporated into an air-tight space smaller than 2.9 CBM (3.3%) and bigger than 0.5 CBM (19%).
So, as long as you don't leave POT to evaporate the max amount of ethanol in a closed space smaller than 2.9 CBM (about the space in a typical SUV) and have flame/spark in that space, it is pretty safe.
POT evaporates ethanol at a low speed of about 50ml/hour, so the density of ethanol gas around the machine is kept at a constant low and this adds to the safety as well.
Still, we advise to always stay alert and use common sense with any flammable/combustable substances, and ALWAYS follow the safety instructions that comes with its bottle or packaging.
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