On his deathbed an old man calls his 3 sons...........But he gives the bag of gold to his third son. What did he bring ?

Question

On his deathbed an old man calls his 3 sons and tells them that all he has is a sack of gold, which will go to the smartest son. He then gives them 1 dollar each and tells them to return at 9pm with something that will fill the room.
The first brings a bag filled with fine cotton.
The second brings a balloon filled with air.
But he gives the bag of gold to his third son.
What did he bring ?

Answer 1

The third son bought a candle and a matchstick. He lit the candle and the room was filled with light.