How to Make an Ice Sphere

Its really easy and simple. And also really awesome & cold!

What's Needed:

1. a balloon
2. a knife
3. water

How much water you're supposed to use depends on how big you want your sphere.

Just make sure you let out all the air before you tie it.

How long should you keep it there? I'd say overnight would be long enough if you want it frozen completely. It freezes from the outside in, so if you want a hollow sphere you might freeze it for about 4 or 5 hours and then punch a hole in the outer ice and drain the water inside.

For example:

1. Adding food colourant
2. Placing it in a strange container
3. Putting objects into it before adding water (marbles, leaves, etc.)

P.S. Its also quite fun to smash the ice spheres!