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Ed Pawlowski

On 2/25/2018 4:13 PM, wrote:

>
> I'm not sure what folks mean by "steaming". It's not possible to
> produce steam except in a sealed pressurized container like a pressure
> cooker. Cooking veggies in an unsealed container with a bit of liquid
> is NOT steaming, that's boiling/stewing. What's seen escaping from a
> boiling pot is water vapor, NOT steam... steam is invisible.
>

Right, what you see is water vapor. It is when the steam you produced
condenses. When you heat water to 100C is changes from from liquid to
vapor, called steam.

The energy or heat consumed per unit mass during the vaporization of a
liquid is called heat of vaporization or enthalpy of vaporization. To
condense water vapor to its liquid phase, energy must be removed from
the gas. The energy per unit mass required to condense water vapor is
equal to the heat of vaporization.