The Evil Lord's Wife Has Spirit Blood

After simply greeting the old tavern lady, Michelle walked into the basement once again, an idea growing in her mind. If she could find a way to lower the atmospheric pressure within the tavern, it could create wind from the basement, which would bring out the humid air.

And then it would be easy to get it out of the tavern. One would just need to close the basement so it wouldn’t fall back there, and then just open windows, creating small wind currents within the building.

But the method had one big loophole. Michelle didn’t have a clue as to how she could lower the pressure.

So she thought back to her old world, and what was known there about pressure. Particularly about the factors affecting it. Altitude, temperature, humidity, and gravitation would be the most important.

The relations between the factors and atmospheric pressure were the following: The higher the altitude or temperature, the lower the pressure. The higher the humidity or gravity, the higher the pressure.

Usually, winds went from places with high pressure to places with low pressure, but the basement was a bit special because it was lower than the ground floor of the tavern. The humidity did make the pressure higher in the basement, but the gravity was too strong to let winds rise upwards with enough force to get rid of the vapor. The small gusts were so weak that a human could never hope to feel them.

So, to make strong enough wind, Michelle needed to widen the difference in temperature between the two places. And there were a few potential ways to do it.

The first, and seemingly the easiest way, was to raise the temperature within the tavern. That way, the warm air there would go higher, creating a space of low pressure there.

But for the pressure differences to be big enough for wind to rise upwards, the temperature would need to be raised to humanly unbearable heights, so Michelle cast the thought aside. She knew no way of raising the temperature at the moment, and even if she did know something, as an ice-element Spirit Master, she detested warmth, so the hotness would kill her.