Alexis is a scientist who is studying solid-state physics. Which activity would she most likely do as a part of this research?
identifying the optimal vessel for containing carbon dioxide
studying the atomic structure of solid carbon dioxide
determining the effect of pressure on the volume of carbon dioxide
observing the natural state of carbon dioxide
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Determining the effect of pressure on the volume of carbon dioxide.

Explanation:

Identifying the optimal vessel for containing carbon dioxide is an activity that the knowledge gap will naturally be closed after determining the effect of pressure on the volume of carbon dioxide. Also, studying the atomic structure of solid carbon dioxide is not a possible activity because CO₂ is not solid, CO₂ is gas. To observe the natural state of CO₂ is a study that the knowledge gas has been closed and factual.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me