We will be assuming that this refers to a simple thermodynamic experiment of changes of temperature in a gas. We want to see which things are variables and which ones are constant.
The correct answer is
The temperature of the gas: V
The amount of gas in the tube (in terms of mass and moles): C
The radius of the tube: C
The temperature of the gas (changed by the water surrounding it): V
The type of gas: C
The pressure of the gas: V
Generally, the way of knowing of something is a variable is if it can change (more exactly, if we can change it in the experiment at will).
So for example
"The temperature of the gas"
Is something that likely will change, because temperature fluctuates a lot, so this is a variable.
"The amount of gas in the tube (in terms of mass and moles):"
A system should be closed so we can study it, so this should be a constant.
"The radius of the tube:"
Similar reasoning than before, while is true that as the temperature changes, there may be some dilation on the tube which would imply in a change of the radius, it depends on the temperature range of the experiment.
For this case, I would say that the radius is a constant, as it is chosen when we select the tube to put the gas in and never change it again.
"The temperature of the gas (changed by the water surrounding it):"
Variable, obviously.
"The type of gas:"
Assuming that the tubes of gas are closed (so the number of moles does not change) is not likely that we can select the type of gas we want to use, so this should be a constant.
"The pressure of the gas:"
As the temperature changes, the pressure is also likely to change, thus this is a variable.
Finally, the correct answer is:
The temperature of the gas: V
The amount of gas in the tube (in terms of mass and moles): C
The radius of the tube: C
The temperature of the gas (changed by the water surrounding it): V
The type of gas: C
The pressure of the gas: V
If you want to learn more, you can read:
https://brainly.com/question/8711877
