Which of the following will not be removed from air by a filter?

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Multiple Choice

Which of the following will not be removed from air by a filter?

Explanation:
Filters work by trapping solids and liquid droplets, not gases. Dust and oil mist are either solid particles or liquid aerosols that get caught by the filter media, so they are removed. Humidity refers to water vapor in the air, which remains a gas and passes through a filter rather than being captured. To actually remove water vapor, you need a dryer or desiccant stage, not a standard filter. So the item that won’t be removed by a filter is water vapor.

Filters work by trapping solids and liquid droplets, not gases. Dust and oil mist are either solid particles or liquid aerosols that get caught by the filter media, so they are removed. Humidity refers to water vapor in the air, which remains a gas and passes through a filter rather than being captured. To actually remove water vapor, you need a dryer or desiccant stage, not a standard filter. So the item that won’t be removed by a filter is water vapor.

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