A clepsydra is like a special water clock that tells time using water flowing from one container to another.
Imagine you have two big cups, one on top of the other. The top cup has a small hole at the bottom, and it's filled with water. When you lift the top cup, water slowly drips through the hole into the bottom cup. As time passes, more and more water moves from the top to the bottom.
Why does this help tell time? Because if the hole is just the right size, the water flows at a steady pace, like how your favorite faucet has a constant drip when you turn it slightly. If you know how long it takes for the top cup to empty completely, you can count that as one hour or any other unit of time.
You can even mark the bottom cup with lines so you can see how much water has collected and tell what time it is, just like counting how many blocks you stack in your tower!
If the hole gets clogged or the water flows too fast or too slow, the clock might not be accurate, but that’s just like when your favorite block tower wobbles if you don’t build it carefully.
Examples
- Imagine pouring water into a jar with a small hole at the bottom; as the water leaks out, you can measure the passage of time.
- If you fill a clepsydra and watch the water level drop, you're watching time itself flow.
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See also
- What is Water clocks (clepsydra)?
- How does a sundial actually tell time?
- What are sand timers?
- What are clepsydras?
- How Does From Rags to Paper Work?