Q1: Air at a particular humidity is heated in a furnace. The new dew point

ANS:B - increases

When air at a particular humidity is heated in a furnace, the new dew point typically increases. Explanation:

• The dew point of air is the temperature at which the air becomes saturated with water vapor and begins to condense into liquid water (dew). It is a function of both the temperature and the humidity of the air.
• Heating air in a furnace increases its temperature while keeping its absolute humidity constant. As the temperature increases, the air's capacity to hold moisture also increases.
• Since the air's absolute humidity remains the same while its capacity to hold moisture increases, the relative humidity of the air decreases. This means that the air becomes less saturated with moisture.
• As a result, the dew point of the air increases because it requires a higher temperature for the air to become saturated again and reach the same level of relative humidity.
• Therefore, when air at a particular humidity is heated in a furnace, the new dew point typically increases.