Why is wet bulb temperature important? How does it effect us?

Question

Edit: Thank you all for the detailed answers! You guys are awesome.

In: 2953

Answer 1

I worked in steam tunnels that had 130°F ambient temps. We use the chart provided by the US Army to determine the length of time that we could stay in the tunnels and also the length of time of required rest with a certain volume of water ingested.