“Option No. 1 (p). Problem No. 1. The relative humidity in a closed vessel at a temperature of 20°C is 30%. Define..."

Independent work in physics on the topic: “Humidity.”

Option No. 1 (p).

Problem No. 1. The relative humidity in a closed vessel at a temperature of 20°C is 30%. Determine the relative air humidity at a temperature of 8°C, if at 20°C the pressure saturated vapors water is 2.33 kPa, and at 8 ° C it is equal to 1.07 kPa.

Task No. 2. In a room measuring 150 m3, the temperature is maintained at 293K, and the dew point is 283K. Determine the relative humidity of the air and the amount of water vapor contained in the room if the pressure of saturated water vapor at 293K is equal to 2.33 kPa, and at 283K it is equal to 1.2 kPa.

Problem No. 3. Relative air humidity in the evening at a temperature of 14°C is 80%. At night the air temperature dropped to 6°C and dew fell. How much water vapor condensed from 1 m3 of air? The pressure of saturated water vapor at 14°C is 1.6 kPa, and at 6°C it is 0.9 kPa.

Problem No. 4. At a temperature of 20°C and a pressure of 760 mm Hg, the air has a humidity of 100%. Find the ratio of the mass of this air to the mass of dry air at the same temperature. Molar mass dry air is 29 g/mol, and the pressure of saturated water vapor at 20°C is 2.33 kPa.

Independent work in physics on the topic: “Humidity.”

Option No. 2 (p).

Problem No. 1. The air temperature is 293K, and the dew point is 281K. determine the relative and absolute humidity of the air if the pressure of saturated water vapor at a temperature of 293 K is equal to 2.33 kPa, and at a temperature of 281 K it is equal to 1.07 kPa.

Task No. 2. In a sealed tube with a volume of 0.4 liters there is water vapor under a pressure of 8.5 kPa at a temperature of 423 K. How much dew will fall on the walls of the tube when it is cooled to the temperature of saturated steam? Tnp=293K, rnp=2.5 kPa.

Problem No. 3. In a room with a volume of 64 m3 at a temperature of 20°C relative humidity air is 60%. Determine the mass of vapor in the air of the room if the pressure of saturated water vapor at 20°C is 2.33 kPa.

Problem No. 4. A vessel of volume V contains air at a temperature of 20°C and a humidity of 40%. Find the relative humidity of the air if it is heated to a temperature of 100°C and the volume is reduced by 4 times. The pressure of saturated water vapor at 20°C is 2.33 kPa.

Independent work in physics on the topic: “Humidity.”

Option No. 3 (c).

Problem No. 1. A sealed tube with a volume of 0.4 liters contains water vapor at a pressure of 8 kPa and a temperature of 150°C. What mass of water will condense on the walls of the tube when it is cooled to a temperature of 22°C? The pressure of saturated water vapor at 22°C is 2.5 kPa.

Problem No. 2. A saucer containing 1 g of water was placed in a vessel with a volume of 10 liters. After this, the vessel was hermetically sealed and left at a temperature of 20°C, at which the pressure of saturated water vapor was 2.33 kPa. What part of the water will evaporate?

Problem No. 3. Mixed 3 m3 of air with a relative humidity of 20% and 2 m3 of air with a relative humidity of 30%. In this case, both portions of air were taken at the same temperatures. The mixture occupies a volume of 5 m3. Determine its relative humidity.

Problem No. 4. The air temperature in the room is 14°C, relative humidity is 60%. The stove was lit in the room and the air temperature rose to 22°C. At the same time, some of the air, along with the water vapor contained in it, went outside and the pressure in the room did not change. Determine the relative humidity at 22°C. The saturated vapor pressures at temperatures of 14°C and 22°C are 1.6 kPa and 2.67 kPa, respectively.

Independent work in physics on the topic: “Humidity.”

Option No. 4 (c).

Problem No. 1. The relative humidity of the air filling a vessel with a volume of 0.7 m3 at a temperature of 24°C is 60%. What mass of water needs to be evaporated into this volume until the steam is completely saturated? The saturated vapor pressure at this temperature is 3 kPa.

Problem No. 2. A vessel with a volume of 100 liters at a temperature of 30°C contains air with a relative humidity of 30%. What will be the relative humidity if 1 g of water is introduced into the vessel? The pressure of saturated water vapor at this temperature is 4.24 kPa.

Problem No. 3. In an evacuated hermetically sealed vessel with a volume of 10 liters there is an open flask containing 10 g of water. The vessel is heated at a temperature of 100°C. What part of the water will evaporate?

Task No. 4. In a horizontal tube sealed at one end there is air with a relative humidity of 60%, separated from the atmosphere by a column of mercury 3.8 cm high. What will the relative humidity be if the tube is placed vertically with the open end facing up? The temperature is maintained constant, Atmosphere pressure normal.

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A little water was poured into a glass flask and closed with a stopper. The water gradually evaporated. At the end of the process, only a few drops of water remained on the walls of the flask. The figure shows a graph of concentration versus time n molecules of water vapor inside the flask. Which statement can be considered correct?

o 1) in section 1 the steam is saturated, and in section 2 it is unsaturated

o 2) in section 1 the steam is unsaturated, and in section 2 it is saturated

o 3) in both areas the steam is saturated

2. Task No. D3360E

Relative humidity in a closed vessel is 60%. What will the relative humidity be if the volume of the vessel at a constant temperature is reduced by 1.5 times?

5. Task No. 4aa3e9

Relative humidity in the room at a temperature of 20 ° C
equal to 70%. Using the saturated water vapor pressure table, determine the water vapor pressure in the room.

o 1)21.1 mm Hg. Art.

o 2)25 mm Hg. Art.

o 3)17.5 mmHg. Art.

o 4)12.25 mm Hg. Art.

32. Task No. e430b9

The relative humidity in the room at a temperature of 20°C is 70%. Using the table of density of saturated water vapor, determine the mass of water in a cubic meter of room.

o 3)1.73⋅10 -2 kg

o 4)1.21⋅10 -2 kg

33. Task No. DFF058

In the figure there are pictures: dotted line - graph of saturated vapor pressure water from the temperature, and a continuous line - process 1-2 due to the change in steam pressure water.

As the water vapor pressure changes, the absolute humidity of the air

1) increase

2) decreases

3) not from me

4) can either increase or decrease

34. Task No. e430b9

To determine the humidity of the air, they use the difference between the dryness and moist thermometer (see ri-su-nok). Using the given ri-sun-ka and the psi-chro-met-ri-che-table, determine what temperature ( in the cities of Cel-sia) is called a dry thermometer, if the relative humidity of the air in the room -NII 60%.

35. Task No. DFF034

In the co-su-de, under the piston, there is unsaturated steam. It can be re-vested into a full-fledged one,

1) iso-bar-but-high-temp-pe-ra-tu-ru

2) adding another gas to the vessel

3) increase the volume of steam

4) reducing the volume of steam

36. Task No. 9C5165

The relative humidity in the room is 40%. How-to-work-out-of-concentration n mo-le-kul of water in the air of the room and the concentration of mo-le-kul of water in saturated water vapor at the same temperature per-ra-tu-re?

1) n is 2.5 times less

2) n is 2.5 times larger

3) n is 40% less

4) n 40% more

37. Task No. DFF058

The relative humidity of the air in the cylinder under the piston is 60%. The air iso-ter-mi-che-ski was compressed, reducing its volume by half. The high humidity of the air has become

38. Task No. 1BE1AA

In a closed qi-lin-dri-che-sky so-su-de, there is moist air at a temperature of 100 °C. In order for you to have dew on the walls of this co-su-da, the volume of co-su-da is 25 once. What is the approximation of the initial absolute humidity of the air in the co-su-de? The answer is given in g/m 3, rounded to whole numbers.

39. Task No. 0B1D50

In a cylindrical vessel under the piston long time there are water and its steam. The piston begins to move out of the vessel. At the same time, the temperature of water and steam remains unchanged. How will the mass of liquid in the vessel change? Explain your answer by indicating what physical laws you used to explain

40. Task No. C32A09

Water and its steam are kept in a cylindrical vessel under the piston for a long time. The piston begins to be pushed into the vessel. At the same time, the temperature of water and steam remains unchanged. How will the mass of liquid in the vessel change? Explain your answer by indicating what physical laws you used to explain.

41. Task No. AB4432

In an experiment illustrating the dependence of boiling point on air pressure (Fig. A ), boiling water under the bell air pump occurs already at room temperature, if the pressure is low enough.

Using a pressure plot saturated steam on temperature (Fig. b ), indicate what air pressure needs to be created under the pump bell so that water boils at 40 °C. Explain your answer by indicating what phenomena and patterns you used to explain.

(A)	(b)

42. Task No. E6295D

Relative air humidity at t= 36 o C is 80%. Saturated vapor pressure at this temperature p n = 5945 Pa. What mass of steam is contained in 1 m 3 of this air?

43. Task No. 9C5165

A man with glasses walked into a warm room from the street and discovered that his glasses had fogged up. What must be the outside temperature for this phenomenon to occur? The room temperature is 22°C and the relative humidity is 50%. Explain how you got the answer. (Refer to the table for the vapor pressure of water to answer this question.)

44. Task No. E6295D

In a closed room there is steam and a certain amount of water. How do the following three quantities change with an iso-thermal decrease in volume: giving -le-nie in co-su-de, mass of water, mass of steam? For each ve-li-chi-ny, the definition of the co-from-the-ve-st of the character from-me-not:

1) will increase;

2) decrease;

3) not from me.

Write down the selected numbers for each physical size in the table. The numbers in the text may be repeated.

45. Task No. 8BE996

The absolute humidity of the air in the qi-lin-dri-che-su-de-su-de under the piston is equal to . The temperature of the gas in the co-su-de is 100 °C. How and how many times is the iso-ter-mi-che-ski required to change the volume of co-su-da in order for it to form on its walls Was there dew?

1) reduce the sewing by 2 times 2) increase the sewing by 20 times
3) reduce the sewing by 20 times 4) increase the sewing by 2 times

46. ​​Task No. 8BE999

In the ex-pe-ri-men it is established that at the same time the air is in the room on the wall of the st-ka-na with With cold water there is a condensation of water vapor from the air, if you reduce the temperature to . Based on the results of these ex-peri-men, the air humidity is determined. To decide, use the table. Does the relative humidity change when the air temperature in the room increases, if the condensation of water vapor from the air will be at the same temperature? Pressure and density of saturated water steam at different temperatures in the table -face:

	7,7	8,8	10,0	10,7	11,4	12,11	12,8	13,6	16,3	18,4	20,6	23,0	25,8	28,7	51,2	130,5

“Problem No. 1. The relative humidity of the air in a closed vessel at a temperature of 20°C is 30%. Determine the relative air humidity at a temperature of 8°C, if...”

Option No. 1 (p).

Problem No. 1. The relative humidity in a closed vessel at a temperature of 20°C is 30%. Determine the relative air humidity at a temperature of 8°C, if at 20°C the pressure of saturated water vapor is 2.33 kPa, and at 8°C it is 1.07 kPa.

Task No. 2. In a room measuring 150 m3, the temperature is maintained at 293K, and the dew point is 283K. Determine the relative humidity of the air and the amount of water vapor contained in the room if the pressure of saturated water vapor at 293K is equal to 2.33 kPa, and at 283K it is equal to 1.2 kPa.

Problem No. 3. Relative air humidity in the evening at a temperature of 14°C is 80%. At night the air temperature dropped to 6°C and dew fell. How much water vapor condensed from 1 m3 of air? The pressure of saturated water vapor at 14°C is 1.6 kPa, and at 6°C it is 0.9 kPa.

Problem No. 4. At a temperature of 20°C and a pressure of 760 mm Hg, the air has a humidity of 100%. Find the ratio of the mass of this air to the mass of dry air at the same temperature. The molar mass of dry air is 29 g/mol, and the pressure of saturated water vapor at 20°C is 2.33 kPa.

Independent work in physics on the topic: “Humidity.”

Option No. 2 (p).

Problem No. 1. The air temperature is 293K, and the dew point is 281K. determine the relative and absolute humidity of the air if the pressure of saturated water vapor at a temperature of 293 K is equal to 2.33 kPa, and at a temperature of 281 K it is equal to 1.07 kPa.

Task No. 2. In a sealed tube with a volume of 0.4 liters there is water vapor under a pressure of 8.5 kPa at a temperature of 423 K. How much dew will fall on the walls of the tube when it is cooled to the temperature of saturated steam? Tnp=293K, rnp=2.5 kPa.

Problem No. 3. In a room with a volume of 64 m3 at a temperature of 20°C, the relative air humidity is 60%. Determine the mass of vapor in the air of the room if the pressure of saturated water vapor at 20°C is 2.33 kPa.

Problem No. 4. A vessel of volume V contains air at a temperature of 20°C and a humidity of 40%. Find the relative humidity of the air if it is heated to a temperature of 100°C and the volume is reduced by 4 times. The pressure of saturated water vapor at 20°C is 2.33 kPa.

Independent work in physics on the topic: “Humidity.”

Option No. 3 (c).

Problem No. 1. A sealed tube with a volume of 0.4 liters contains water vapor at a pressure of 8 kPa and a temperature of 150°C. What mass of water will condense on the walls of the tube when it is cooled to a temperature of 22°C? The pressure of saturated water vapor at 22°C is 2.5 kPa.

Problem No. 2. A saucer containing 1 g of water was placed in a vessel with a volume of 10 liters. After this, the vessel was hermetically sealed and left at a temperature of 20°C, at which the pressure of saturated water vapor was 2.33 kPa. What part of the water will evaporate?

Problem No. 3. Mixed 3 m3 of air with a relative humidity of 20% and 2 m3 of air with a relative humidity of 30%. In this case, both portions of air were taken at the same temperatures. The mixture occupies a volume of 5 m3. Determine its relative humidity.

Problem No. 4. The air temperature in the room is 14°C, relative humidity is 60%. The stove was lit in the room and the air temperature rose to 22°C. At the same time, some of the air, along with the water vapor contained in it, went outside and the pressure in the room did not change. Determine the relative humidity at 22°C. The saturated vapor pressures at temperatures of 14°C and 22°C are 1.6 kPa and 2.67 kPa, respectively.

Independent work in physics on the topic: “Humidity.”

Option No. 4 (c).

Problem No. 1. The relative humidity of the air filling a vessel with a volume of 0.7 m3 at a temperature of 24°C is 60%. What mass of water needs to be evaporated into this volume until the steam is completely saturated? The saturated vapor pressure at this temperature is 3 kPa.

Problem No. 2. A vessel with a volume of 100 liters at a temperature of 30°C contains air with a relative humidity of 30%. What will be the relative humidity if 1 g of water is introduced into the vessel? The pressure of saturated water vapor at this temperature is 4.24 kPa.

Problem No. 3. In an evacuated hermetically sealed vessel with a volume of 10 liters there is an open flask containing 10 g of water. The vessel is heated at a temperature of 100°C. What part of the water will evaporate?

Task No. 4. In a horizontal tube sealed at one end there is air with a relative humidity of 60%, separated from the atmosphere by a column of mercury 3.8 cm high. What will the relative humidity be if the tube is placed vertically with the open end facing up? The temperature is maintained constant and the atmospheric pressure is normal.

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