Have you ever been anywhere so humid that your sweat won't evaporate? Record-breaking temperatures are being experienced across the world this year, with Portugal reaching 47C and a new high of 49C in Delhi, India. These heatwaves have reignited the debate about how we can protect people from extreme heat – and what is the highest temperatures we can withstand? It's not only the dry temperatures we see on weather forecasts that matter. Enter the wet bulb temperature, as Jocelyn Timperley explains. #wetbulb #wetbulbtemperature #humidity #temperature #weather #heat #climatecrisis #globalwarming #extremeweather #heatwave #sweat #sweating #keepingcool