y does one perspire on a humid day??

I wonder if you have gone through the following threads whereby we discussed sweating abd humidity:

http://csecduac.in/viewtopic.php?t=836&highlight=humidity
http://csecduac.in/viewtopic.php?t=755&highlight=humidity

But, you may contend that we never discussed the question that you have raised. So here is my reply Our body constantly sweats to keep its temperature whenever the ambient temperature is above normal. But, the sweat gets evaporated resulting in some cooling of our body. On a rather humid day, this evaporation gets hampered, therefore there is more sweat on our body!!!

For some more information one may visit the following link:

http://www.myoan.net/facts/facts_perspire.html

Actually following was going on in my head while posting this question.
The epidermis of our skin posess several cells ,and one of them is keratinocytes which produce keratin and keratin helps in waterproofing the skin .So if keratin do not cover the sweat pores ,how is water in the atmosphere stopped from entering them and if keratin covers them ,den how does sweat(which contains water) move out of these pores??

Good curious mind

I think you will be able to get an answer to your questions if you click on the following link:

http://health.howstuffworks.com/skin-care/information/anatomy/sweat2.htm

thnku sir..