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7. Which is the best description of when water boils?a. It is when the vapor pressure of water equals the surrounding atmospheric pressure.b. It is when the first bubble appears in a sample that is being heated.c. It is when bubbles are continually forming in a sample that is being heated.d. It is when the temperature of the water reaches 100 °C.

Sagot :

The alternative b is not a good description because you can form bubles without the water being boiling yet.

Also, alternative c is also not a good option because it is just a description of what is being seen, it could be replicated in other ways.

Alternative d only gives a termperature, and the boiling temperature can change depending on other conditions.

The alternative the best describes is alternative A.