"Mom just bought me a snow globe!" Eon is excited to show off his new toy — and it turns out a snow globe is a tiny science experiment you can hold in your hand. "You can shake it. Look at that — the snow falls down." Give it a shake, and a little blizzard swirls up inside the glass. Then he finds a button: "you pull it and the red light" glows. "And then it change to green and change to blue." Shake it again, and the snow seems to change color too. Let's look at what's really going on inside.
What's inside a snow globe
A snow globe isn't full of air like the room around you — it's full of water. Floating in that water are lots of tiny, light flakes. They're made to be very light so they can drift instead of just dropping like a stone. When the globe sits still, the flakes have already settled in a little pile at the bottom, and everything looks calm and clear.
Why the snow floats, then falls
When Eon shakes it, he mixes all those flakes back up into the water, so they swirl everywhere — that's the "snow." Then comes the best part: the snow slowly falls down, just like he said.
Why so slowly? Because the flakes are falling through water, not air. Water is thick and pushes back on anything moving through it. You feel this yourself when you try to run in a swimming pool — the water slows your legs down. The same water gently slows the flakes, so instead of dropping fast they drift down like real snow on a quiet day. Wait a little while, and they all settle to the bottom again, ready for the next shake.
The red, green, and blue light
Eon's globe has a bonus: a little light you switch on by pulling the button. It glows red, then green, then blue. Because the water and glass are clear, the colored light can shine right through and light up every flake. So when the light is red, the floating snow looks red; switch to blue, and the snow looks blue. The flakes themselves didn't really change — the light shining through them did, and that's enough to paint the whole snowy scene a new color.
Try it
Make your own mini snow globe. Fill a small clear jar almost to the top with water, then add a spoonful of glitter or tiny foam bits for "snow." Screw the lid on tight, shake it, and watch the flakes swirl and then drift slowly down — that slow fall is the water pushing back. For Eon's color trick, shine a flashlight through the jar in a dark room and tape a piece of red, green, or blue cellophane over the light. Watch your snow change color, just like in the globe.