To measure a specific volume of a gas, you must have a(n)
a. scale.
b. open container.
c. closed container.
d. open or closed container depending on the type

The correct answer is option c.

Explanation:

Gas is example of fluid.

Fluid is a freely flowing substance with no definite shape. They can be easily changed. Other examples of fluid are water, oil etc.

To measure the specific volume of the gas we must have a container along with the lid to seal the gas inside the container. If not sealed the gas will flow out of the container and that will result recording of incorrect values for specific volume of gas.

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.