The movement of the hydrophobic gas nitrous oxide (n2o) (laughing gas) into a cell is an example of

This is an example of diffusion. The nitrous oxide is moving from an area of higher concentration, down the gradient into the cell, which has a lower concentration. Since the cell doesn't have as much N2O as the surrounding environment, the gas will move inside the cell as a way of attaining equilibrium.

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Solubility would be your answer.