I am confusion! why are there massive difference between cooked and uncooked pasta, does the pasta increase in size therefor weigh more, making 100g consists of less pasta, but since its water weight it got no calories, therefor less, or does the pasta lose its caloric value when boiled?

I am confusion! why are there massive difference between cooked and uncooked pasta, does the pasta increase in size therefor weigh more, making 100g consists of less pasta, but since its water weight it got no calories, therefor less, or does the pasta lose its caloric value when boiled?