We can confirm that for the experiments regarding Boyle's law, the book was used to increase pressure on the gas and add additional weight.
The book is used for the reasons described in options 1 and 2 of the question. The book supports additional weights on the container, meaning that through these added weights we can increase the pressure being applied to the gas and see how said pressure affects the volume of a gas.
Therefore, we can confirm that the book was used to increase pressure on the gas and add additional weight.
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