My Introduction & my first Lecture on Wonders of Chemistry

Hello Dear Havians, I hope you all will be OK.

I am Muhammad Javed and I have done Masters in Chemistry. I am lecturer in College where I teach Chemistry to students.

I shall post here simple but interesting facts about Chemistry topics.

Today, I shall start with the following topics:

1- Why the ice is dry?

2- Why weather balloons rise in air?

3- Why sky looks blue?

4- Why iron nail floats in Hg but sinks in water?

5- Why black bottom cooking pans are preffered?

Thank you for your time and see you soon with more interesting facts.

I appreciate @theycallmedan, @rocky1, @appreciator for their efforts to make this platform awesome.