What is the dewpoint temperature when the relative humidity is 30% and the air
temperature is 20°C?

For air at atmospheric pressure and at a temperature of 20°C, containing water vapor such that the relative humidity is 30%, the partial pressure of the water vapor is Pw = 0.30×Pg (according to the definition of relative humidity), where Pg is the pressure of saturated water vapor. Referring to a thermodynamics table containing the properties of saturated water (H2O), Pg = 0.002338 MPa. So, Pw = 0.30×0.002338 = 0.0007 MPa. We wish to calculate the air pressure inside the container so that Pw = Pg. This means that the partial pressure of the water vapor inside the container is equal to the pressure of saturated water vapor (at 20°C). If we increase the air pressure by some multiple M, then the partial pressure of the water vapor present in the air will increase by the same multiple M (based on Dalton's law of partial pressures). Therefore, M = 0.002338/0.0007 = 3.34. The maximum pressure inside the container is then 3.34×(atmospheric pressure) = 340 kPa, approximately, for atmospheric pressure = 101.3 kPa. At this pressure the water vapor will begin to condense inside the container (at the dew point temperature of 20°C). Note that having water condense inside the container can be undesirable given that it can cause corrosion or mold growth. This is prevented by keeping the pressure inside the container less than 340 kPa, so that water condensation doesn't occur.

Hope this helps:)

Dew Point Temperature: 1.9°C or 35.4°F

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.