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Plastic colored ... Usually, they use the plastic in the form of raw color pellets. Then they add the "masters", which are other pellets of the same plastic (more or less) but with an high concentration of dye or pigments, following the recipe to get the right color. They mix that in a tank and...

Actually, evaporation is a continuous process enhanced by the temperature. You still get some at very low temperature, but it just doesn't give enough gaseous volume to run the engine. Look at the water, it evaporates even in the ice form. The molecules are always moving and bouncing against...

It lacks a word in your last sentence : In short, boiling gas needs negative pressure as it vaporize before boiling in atmospheric pressure.