What is partial pressure? How is it represented?

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(N/A) Partial pressure is the pressure contributed by an individual gas in a mixture of gases. It is represented by the letter $p$ followed by the chemical formula of the gas. For example,the partial pressure of oxygen is represented as $pO_{2}$ and the partial pressure of carbon dioxide is represented as $pCO_{2}$.

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Almost the same $pCO_{2}$ in humans is found in

$A$: Diffusion of carbon dioxide is $20$ times faster than oxygen.
$R$: It is due to difference in partial pressure as well as solubility of diffusing gases.

Maximum amount of oxygen is exchanged from the blood in the . . . . . . .

Identify the correct option for the diffusion membrane.

The solubility of $CO_2$ is ....... times higher than that of $O_2$.

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