1. Grate one of the oranges to make zest. Measure out 1 tablespoon.
Grown-up helpers can slice oranges in half. Kids can use the juicer to squeeze the juice from the oranges.
3. Pour the orange juice into a measuring cup. It should measure about 1 cup of juice. Add the orange zest. Let sit for 5 minutes.
4. Pour the orange juice through a strainer set on top of a pitcher. Add 2 cups of sparkling water and stir well. Add simple syrup to taste.
5. In one glass: Put 1 scoop of ice cream into a tall glass. Measure out ½ cup of sparkling orange juice and pour it over the ice cream.
6. In the other glass: Put ½ cup of sparkling orange juice in a glass. Add the ice cream on top.
7. Which one fizzes more? Take a guess—and then sip your science experiment!
A sparkling clementine juice is a good substitute for the homemade orange fizz. Or, you can use ½ cup seltzer with a splash of orange juice.
9. Sipping Science
Although both glasses have the exact same ingredients, the order you add them makes a big difference. So why does the float foam more when you start with the ice cream in the glass? That’s because ice cream has lots of tiny bubbles of air. When you pour soda on top, the carbon dioxide comes out and the drink bubbles up. Ice cream also contains thickeners. As you pour the soda over the ice cream, some of the ice cream melts and the thickeners mix with the soda. That’s why your float gets nice and creamy!