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Mushrooms brown only after their water boils off

A hot pan full of mushrooms steams long before it sears

Fresh mushrooms are roughly ninety per cent water, so a crowded pan stalls at simmering point while the moisture escapes. Once the surface water is gone the temperature can rise above the boiling point and Maillard browning begins. Salting early draws out more water and lengthens the process, which is why many cooks wait.

Where this comes from

Encyclopaedia Britannica

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Tags: mushrooms, browning, cooking

Mushrooms brown only after their water boils off: the short answers

Where does this come from, and can I check it?
A hot pan full of mushrooms steams long before it sears. The figure is taken from Encyclopaedia Britannica, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
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