At constant temperature, the product of pressure and volume of a given amount of gas is constant. This is according to: a. charles law b. Gay lussac's law. c. Boyle's law. d. Avogadro's law​

u i forgot the answer?

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

if you're asking what comes out, it's steam.