The temperatures in North India and Delhi has been record-breaking and unbearable!

And due to extreme weather conditions, there has been many reports of deaths due to heatstroke and related ailments.

But do you know how much heat can a human body tolerate?

Experts mention humidity and the 'wet bulb' temperature to understand how much heat a human body can sustain. The wet bulb temperature is a meteorological term used to describe lowest temperature that can be reached by evaporating water into the air at constant pressure. This temperature helps measure humidity and understand how much water can evaporate into the air, affecting things like comfort, farming and weather patterns.

According to a Delhi-based think tank, Centre for Science Environment (CSE), the body works best within a narrow range of body temperature - 36 degree Celsius to 37.5 degree Celsius. Once 40 degree Celsius is reached, it can be dangerous even with low humidity levels. With temperature touching 50 degree Celsius, the situation is critical.

When the air temperature is 46.1 degrees Celsius with a relative humidity of 30%, the wet bulb temperature is 30.5 degrees Celsius. But when the air temperature is 38.9 C and the relative humidity is 77%, the wet bulb temperature is about 35 degree Celsius.

Humidity aggravates heat conditions, making it harder for a body to process hot temperatures. With more water in the air, it harder for sweat to evaporate off the body.

But when body is too hot, people tend to start breathing more heavily, and their heart rates can go up, say medical experts, as reported by News18.

Once a person's body can no longer get rid of excess heat , condition known as "heat stress," the core temperature rises. That can result in confusion, nausea, dizziness, headache or fainting.

Continued exposure to 48-50 degree Celsius and beyond leads to a severe breakdown of muscle and even death.

Once body temperature rises, the brain can struggle to process information, there could a drop in cognitive function, which can affect judgment and put people at risk of falling. In extreme cases, high heat can even cause dangerous brain inflammation and failing human heart.