This spring, I gave the girls each a planter box, to use as their own little garden space. The rain has been generously watering their seeds, up until now. Now that the sunshine has arrived (hurray!), it's time to think about watering cans.
Rather than run out, and buy individual watering cans for each of the girls (because really, who could share such a thing!?!), I decided to let them make their own, using science.
We started with plain old, empty pop bottles, hammering a hole in the lids, and several holes in the bottoms.
The girls discovered, when they fill them with water, and put the lids on, the water will stream from the bottom, because air is getting into the bottles, and pushing down on the water, forcing it out of the holes....
...until they cover the hole in the lid. Then, the water stops pouring, because the air pressure outside the bottle is stronger than inside, and because the surface tension of the water, helps to seal the holes. You can read more about this, here, on Steve Spangler's site.
Even with the top hole covered, they still drip a little (we put a lot of holes in the bottoms of the bottles), so I wouldn't want them filling them in the kitchen, and then walking through the house with them. But, they work pretty well for getting water from the outside faucet...
...to their gardens. And, they give that nice, gentle, sprinkle of water, that won't wash the dirt away from the seeds.
For more fun with science, check out this week's Science Sunday link-up at Adventures in Mommydom.
It's great to be a homeschooler.