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    How does drying agent works?
    The set up contains a flask of potassium hydroxide solution, a flask of lime water, a bell jar contain a rat in it, a U-tube filled with drying agent, and then a flask of potassium hydroxide solution. The air passes through the flask in the above sequence.
    The Question has given the weight changes record of the last flask (Potassium Hydroxide Solution).
    Can I ask why does such a weight changes happened? Is it related to the dry agent ?

    The drying agent, or dessicant, removes the water from the air. In respiration, the two products are carbon dioxide and water, which also happen to be in our breath. By removing the water, that way we ONLY measure the carbon dioxide added to the final flask, in theory.
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Updated: October 30, 2017

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