Food Engineering Exam 3
the total pressure exerted by the mixture equals the sum of the partial
Gibbs-Dalton's Law pressures that each individual gas would exert if it occupied the same
space independently.
also known as specific humidity, represents the absolute quantity of
Humidity Ratio (W)
moisture in the dry air, expressed as a mass ratio
the ratio of the current amount of water vapor in the air to the maximum
Relative Humidity (RH)
amount of water vapor that the air can hold at a given temperature
What does Relative Humidity how close the air is to saturation
indicate?
T or F: Relative Humidity changes with True
temperature, even if the humidity ratio
remains constant
T or F: As the Temperature drops, True
Relative Humidity increases towards
saturation
Why does the air feel dry in the winter warmer air can hold more moisture, which decreases the relative humid
with a heater on? making it feel drier
, Food Engineering Exam 3
Why does a cold beverage condense The air near the cold surface is cooled to its dew point, causing water
during summer? vapor to condense
the temperature measured by a regular thermometer exposed to the a
Dry Bulb Temperature (DBT)
represents actual air temperature
the temperature reached by evaporative cooling, it reflects the lowest
Wet Bulb Temperature (WBT)
temperature air can reach through evaporation
T or F: Wet bulb temperature is always True, because evaporation of wet bulb cools it.
lower than dry bulb temperature
What does a small difference more humid air, nearing saturation
between WBT and DBT indicate?
What does a large difference drier air
between WBT and DBT indicate?
the temperature at which water vapor in the air mixture begins to cond
Dew point temperature
or when the RH reaches 100% (saturation)
What is saturation? a Relative Humidity of 100%
T or F: Dew point temperature and False, they are the same value
saturation temperature are two
different values?
the total pressure exerted by the mixture equals the sum of the partial
Gibbs-Dalton's Law pressures that each individual gas would exert if it occupied the same
space independently.
also known as specific humidity, represents the absolute quantity of
Humidity Ratio (W)
moisture in the dry air, expressed as a mass ratio
the ratio of the current amount of water vapor in the air to the maximum
Relative Humidity (RH)
amount of water vapor that the air can hold at a given temperature
What does Relative Humidity how close the air is to saturation
indicate?
T or F: Relative Humidity changes with True
temperature, even if the humidity ratio
remains constant
T or F: As the Temperature drops, True
Relative Humidity increases towards
saturation
Why does the air feel dry in the winter warmer air can hold more moisture, which decreases the relative humid
with a heater on? making it feel drier
, Food Engineering Exam 3
Why does a cold beverage condense The air near the cold surface is cooled to its dew point, causing water
during summer? vapor to condense
the temperature measured by a regular thermometer exposed to the a
Dry Bulb Temperature (DBT)
represents actual air temperature
the temperature reached by evaporative cooling, it reflects the lowest
Wet Bulb Temperature (WBT)
temperature air can reach through evaporation
T or F: Wet bulb temperature is always True, because evaporation of wet bulb cools it.
lower than dry bulb temperature
What does a small difference more humid air, nearing saturation
between WBT and DBT indicate?
What does a large difference drier air
between WBT and DBT indicate?
the temperature at which water vapor in the air mixture begins to cond
Dew point temperature
or when the RH reaches 100% (saturation)
What is saturation? a Relative Humidity of 100%
T or F: Dew point temperature and False, they are the same value
saturation temperature are two
different values?
