Corn sweat is exactly what it sounds like: moisture given off by corn. With large swaths of corn fields in the Midwest and even into Michigan, the amount of moisture in the air increases on hotter days.

A phenomenon called "corn sweat" could exacerbate the impacts of the extreme heat blanketing a large portion of the U.S., according to experts.

The process is known as evapotranspiration, which is how plants, including corn, release water vapor into the atmosphere.