Take 50ml of water with the measuring jar and pour it in a glass.mark the level of water on the glass and throw it out
now measure 50ml of milk with measuring jar and pour it in the same glass mark the level of the milk on it
1---are the levels of milk and water same?
remove the milk from the glass.now pour oil into the glass upto the level marked for water\
2--can u guess the volume of oil