What's in the coke that stops an egg from bouncing ?

is it caffeine

The main ingredient in Coca-Cola that makes an egg not bounce is actually carbon dioxide (CO2) gas, rather than caffeine. Carbonation is the process of adding carbon dioxide gas to a liquid, creating bubbles and fizz. In the case of Coca-Cola, the carbonation is what gives it its characteristic fizziness.

The reason an egg placed in a glass of Coca-Cola doesn't bounce is because the carbon dioxide bubbles adhere to the surface of the eggshell, creating a layer of gas that surrounds the egg. This layer of gas acts as a cushion, reducing the impact force and preventing the egg from bouncing.

Now, to determine whether caffeine has any effect on the egg's bouncing ability, you could conduct an experiment. Here's how:

1. Prepare three identical glasses, fill them with Coca-Cola, and label them as A, B, and C.

2. In glass A, do not add anything. This will serve as the control group.

3. In glass B, add a measured amount of caffeine. You can use caffeine tablets or a caffeine-based beverage like coffee. Be sure to measure the exact amount for accuracy.

4. In glass C, add an equal amount of a substance that does not contain caffeine but has the same texture or color (such as a caffeine-free soda).

5. Carefully place an egg in each glass, making sure they are fully submerged.

6. Observe the eggs over a period of time (24 hours, for example) and note any differences in appearance or texture. Try gently tapping the eggs to see if they bounce differently.

By comparing the bounce of the eggs in each glass, you can determine if caffeine has any impact on the egg's ability to bounce. However, keep in mind that the main factor affecting the bounciness of an egg immersed in Coca-Cola is the carbonation rather than the caffeine content.