salaam to all...... here r a few questions that i want to ask.in fact i found contradictory answers of these questions so kindly tell me answers with a little explanation.
1.what happens to the boiling point of a liquid if the pressure is decreased?
2;why does a piece of ice make liquid cold?
3;why does lift pump fall beyond a particular height?
4;what weight of air do v carry?
5;what is L.S.D stand 4?what is it indeed?
6;what is the meaning of one horsepower?

thanx in advance.
REGARDS