What produces more severe burns,boiling water or steam?

State whether the following statement is true or false:
The term $vapor$ describes the gaseous state of a substance that normally exists as a liquid or solid.

The gases can be liquefied by

Why does water as steam cause severe burns,whereas water as ice has a cooling effect? Explain.

Once Ram's mother Sunita went to her friend's home along with Ram. On visiting there,Ram saw a wet khus-khus screen hung at the door of the room. He asked his mother why they had hung this screen,and his mother answered that it keeps the room cool. Ram was satisfied and smiled.
$(a)$ According to you,what qualities are possessed by Ram?
$(b)$ How does a wet khus-khus screen hung at the door keep the room cool?

What is dry ice? What happens when the pressure under which it is stored is decreased to $1$ atmosphere?