Questions about example sentences with, and the definition and usage of "Gas"

Jeez, you're still going eh? Man, your questions keep getting harder. With this one it sounds like a colloquialism or just a military term. It's clear he means "shut it off" but I can only guess at the reason he uses the word gas. I'm guessing it's because they have experience with using gas to knock people out. Gas people and the chatter you heard stops. Gas a radio and same thing happens.

I think so. We don't really have clerks fill up our tanks often, so that's why I was confused at first, but it does sound as if that's what the sentence means.

The "it came" refers to the car bought And that the "tank of gas" or fuel that was in the car was free This usually happens as a thank you for buying the car

What

Yes, like that! :D

The "a" feels unnatural to speak aloud before "better" without a suffix like "rating" following "gas mileage." Which car has better gas mileage? Which car has a better gas mileage rating? You could even say: Which car has better mileage? Then it doesn't matter if the fuel is gasoline, diesel, or even propane.

they mean the same thing, but different places/countries use different words. In American people usually say gas station

Yes that is good, but you can also say "... discharge more carbon dioxide..." without the "gases". It still works and it's understandable

Here you are: I went to Scotland in September, it was a nice trip. The people there [are] kind, [and the] landscape is beautiful. Just one thing was bad: they like to drink warm beer without [carbonation]. The gas that comes out of a drink to make it bubbly is called "carbonation", and drinks that have it (such as beer) are "carbonated" drinks. A carbonated drink that has had all of its gas removed - perhaps by being left open for too long - is considered "flat", sort of like a "flat tire" has had its gas removed.

sparkLING water

Noble gases are monatomic gases.

The term "on a good day" is similar to "in a best-case scenario"

I think the sentence is slightly broken, but I'll explain that part later. "the smartphone" is the subject. The core of the sentence is "the smartphone signals that it has detected the gas". In other words, the smartphone somehow detects the gas, and then does something as a result. "the gas in question" just means some specific gas they are talking about. "by sensing a change in electric current" is the way that the smartphone detects gas. The "tag" is some device which generates a different level of current depending on whether the gas is present. So, "by sensing a change in electric current" should describe "has detected". The smartphone signals that it has detected (by sensing the change in current) the gas in question. I think the sentence is broken because it seems to use "by sensing the change" to describe "signals". This makes no logical sense, so it is probably not what the writer actually meant. I might say: When the smartphone senses the change in electric current on the tag, it signals that it has detected the gas in question. (Here "it" refers to the smartphone, not the tag.)

You're introducing an example. This is the first time you mentioned these gases, so if you said "the" hydrogen gas, we'd be wondering what hydrogen gas you're talking about as if we should already know but don't.

1. My car guzzles more gas than yours. 2. Doing this job takes/requires a lot of energy. Guzzle means to consume something greedily.

I replaced my kerosene heater with a gas heater. That has saved me the effort of buying kerosene but increased the cost. (I think we would usually call kerosene "paraffin", but that may be a local thing.)

This would be more natural: Y: Oh man, I'm almost running out of gas, besides your girlfriend's house is too far away, so if you don't mind, we'd better head straight to John's house.

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