Hello I would like to know how do I measure a volume of a balloon blown by using water. I think I can put it in two buckets and measure the amount of water that left the smaller bucket into the bigger one. But would that be my answer the amount of water left in the larger bucket or do I have to make other calculations. :)

You need to measure the amount of water displaced by the balloon. So if you put it in one gallon of water and the water level rose to a 1.7-gallon line, the balloon had the same volume as a 0.7 gallons of water.

Hello I would like to know how do I measure a volume of a balloon blown by using water. I think I can put it in two buckets and measure the amount of water that left the smaller bucket into the bigger one. But would that be my answer the amount of water left in the larger bucket or do I have to make other calculations. :)
Of course you could use the formula of the content of a sphere of the same size...
;)