When someone does something or takes part in something, this person gets involved in an activity. So, it can be said that activity is a state of doing something or being involved in that process. Similarly, energetic physical exercise or movement is also known as activity.
In chemistry this term indicates the capability of some substance [...]

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Working gives different meanings in different context; it refers to someone actively engage in paid work for instance the working population, a working woman etc. It also refers to running of a machine that is capable to perform something. It also refers to something that is sufficient for practical use for instance working knowledge of [...]

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