The gas most likely is one of the noble gases.
descriptions; explanation
Because it was demonstrably the best explanation for the observations that could be made.
An explanation of things or events based on many observations is a theory.
That would depend on your observations and your explanation.
A scientific explanation is a hypothesis derived from existing research or observations that can be tested through experiments or further observation. It must be based on empirical evidence and subject to scrutiny and validation by the scientific community. By testing the explanation, scientists can determine its validity and refine our understanding of the natural world.
Scientists use the term "hypothesis" to refer to a possible explanation or answer to a question. A hypothesis is typically based on existing knowledge and observations and can be tested through experimentation and observation. It serves as a foundation for further investigation and helps guide the scientific method.
thesis
hypothesis ?
An hypothesis consists of a group of propositions that collectively form an explanation for a set of observations. If the scientists disagree on the truth of one or more central propositions, they may end up with very different hypotheses to explain the same phenomena.
A set of controlled observations that test a proposed explanation are known as an experiment. The proposed explanation is known as the hypothesis of the experiment.
hypothesis
Hypothesis