Marcus stood in the lobby. The thermometer still read 72°F, but the air felt crisp. The heaviness was gone. Mr. Henderson walked by, no longer mopping his brow, and gave them a thumbs up.
"Exactly. You’ve just found the state of the air in the lobby. That single dot represents all the invisible water vapor currently torturing our guests." how to use a psychrometric chart
(measured with a standard thermometer). Relative Humidity (measured with a hygrometer). Marcus stood in the lobby
She drew a straight horizontal line from the dot to the left, stopping at the 55°F vertical line. You’ve just found the state of the air in the lobby
Marcus traced his finger up the grid. "Got it."
"It feels like a swamp in here!" Mr. Henderson shouted, mopping his brow with a handkerchief. "The thermostat says 72 degrees, but I’m dripping with sweat!"