Possible Clues:

• H
• Lightest element
• Gas
• Some of the water on the top of the table is the first one you'll see
• It combines with oxygen to form water
• The most abundant chemical element in the universe
• Gaseous element
• Lightest gas
• Pig swallows dry mixture from scenic centre - it's gas!
• It's great gas for H to start to go up high