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There are tons of idioms with 気. There is no simple definition of 気. It can refer to one's spirit, mind, disposition, mood, intention, feeling, attention, interest, etc. It can also refer to the atmosphere or the essence of something. All of these have a common theme. Once you begin seeing expressions with it, this will become much clearer. 

　  The literal interpretations of idioms gives us an insight on how truly different Japanese words things in comparison to English. Don't let this, though, make you unable to understand them. Keep in mind that 気 is just a normal noun. There's nothing really different from it than words in English with lots of usages or those found in many set phrases.

Don't view this list as bunch of set phrases whose literal meanings are just bizarre. This is certainly not how the Japanese view them. In every language, there are idiomatic phrases that have deviated so far from the original meanings of the words that they are composed of that you have to treat them as separate items in one's vocabulary. But, for the most part, the Japanese really think of 気 expressions with the literal interpretations provided in the right column.

Also, idioms are not equal in idiomacy (level of being idiomatic). Some may be very similar to the English phrasing minus a word here and there. The Japanese itself in 気 phrases may be far more abstract than others. For instance, 気が重い is more straightforward than 気をそろえる. Keep all of this in mind as you look at this list and the example sentences that follow.