How do you measure the water cooking?

You can't "measure" water cooking in the same way you would measure a physical quantity like temperature or volume. Cooking water doesn't change its volume significantly, and the temperature of the water is what matters, not the water itself.

Here are some ways to tell if your water is cooking:

1. Look for bubbles: When water boils, it forms bubbles that rise to the surface. This is the most obvious sign that the water is cooking.

2. Use a thermometer: You can use a kitchen thermometer to check the water's temperature. Water boils at 212°F (100°C).

3. Watch for steam: As water heats up, it evaporates and creates steam. You'll see steam rising from the pot when the water is close to boiling.

4. Feel the steam: Be careful! If you're not using a thermometer, you can carefully hold your hand near the top of the pot. If you feel the heat of the steam, the water is close to boiling.

Remember: It's important to watch your water while it's heating to make sure it doesn't boil over. Keep an eye on it and adjust the heat as needed.