How can an album enter the singles chart?!

Question: i hear Frank Sinatra's Songs for Swingin' Lovers was the first LP to make no. 1 on the singles chart.
how or why is this possible?

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Answers: i hear Frank Sinatra's Songs for Swingin' Lovers was the first LP to make no. 1 on the singles chart.
how or why is this possible?

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That can't be possible. Because, well, it isn't a single.

It was the first album that made it to no. 1 in the UK charts, but not in the singles chart.

An album really can't get into a singles chart, no matter what. It has its own category to be charted at.

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