Which of the following statements is correct?
question 10 options:

air is heavier than steam.

steam is heavier than air.

tightly packed trays allow for better steam penetration.

drain lines don't need to be cleaned.

it all depends on the are the statements? ?

well when looking at this if you think about it   negativley and positivley   react with each other and when the first layer gets full they add layers it starts with 2 on the first layer and it constantly goes on until the official number is there

the answer is : )