A wet porous substance in the open air loses its moisture at a rate proportional to the moisture content. If a sheet hung in the wind loses half its moisture during the first hour, when will it have last `95%` moisture, weather conditions remaining the same?
A wet porous substance in the open air loses its moisture at a rate proportional to the moisture content. If a sheet hung in the wind loses half its moisture during the first hour, when will it have last `95%` moisture, weather conditions remaining the same?
Text Solution
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The correct Answer is:
(i) `t=(log 10)/(log 2)` hours (ii) `(log 100)/(log 2)` hours.
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A wet porous substance in the open air loses its moisture at a rate proportional to the moisture content. If a sheet hung in the wind loses half its moisture during the first hour, when will it have lost 90% , weather conditions remaining the same?
Clouds are an essential part of the weather conditions which exist around us. Warm air rises upwards in the atmosphere carrying with it dust and moisture from evaporated surface water. At higher altitudes the air is cooler and the vapour in the warm air reaches its .dew point. where it changes either to small particles of ice or into water, thus forming clouds. Since cloud formation takes place at different heights and temperature, clouds are of different types. There are basically three main types of clouds. Up to about 1-5km from the ground we generally see the first type called the .stratus. cloud, on occasions it is the grey stratus clouds which bear light rain. In colder areas the water in these clouds freezes, thus resulting in snowfall. Slowly rising warm air produces these clouds. Above these and up to about 4-5 km lie the .cumulus. clouds, the fluffy shapes are a result of quickly rising warm air. Above the cumulus clouds, at an altitude of about 14 km, float the .cirrus. types of clouds. Cirrus clouds are wispy clouds formed at such a high altitudes that they contain only ice crystals. Laying between these three main types of clouds are other types like the .stratocumulus., .altocumulus., .cirrocumulus., .altostratus. and .cumulonimbus. clouds. What are the three main types of clouds?
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A wet porous subtance in the open air loses its moisture at a rate proportional to the moisture content. If a sheet hung in the wind loses half its moisture during the first hour, then the time when it would have lost 99.9% of its moisture is (wether conditions remaining same)
A wet porous subtance in the open air loses its moisture at a rate proportional to the moisture content. If a sheet hung in the wind loses half its moisture during the first hour, then the time when it would have lost 99.9% of its moisture is (wether conditions remaining same)
A
more than 100 h
B
more than 10 h
C
approximately 10 h
D
None of these
Clouds are an essential part of the weather conditions which exist around us. Warm air rises upwards in the atmosphere carrying with it dust and moisture from evaporated surface water. At higher altitudes the air is cooler and the vapour in the warm air reaches its .dew point. where it changes either to small particles of ice or into water, thus forming clouds. Since cloud formation takes place at different heights and temperature, clouds are of different types. There are basically three main types of clouds. Up to about 1-5km from the ground we generally see the first type called the .stratus. cloud, on occasions it is the grey stratus clouds which bear light rain. In colder areas the water in these clouds freezes, thus resulting in snowfall. Slowly rising warm air produces these clouds. Above these and up to about 4-5 km lie the .cumulus. clouds, the fluffy shapes are a result of quickly rising warm air. Above the cumulus clouds, at an altitude of about 14 km, float the .cirrus. types of clouds. Cirrus clouds are wispy clouds formed at such a high altitudes that they contain only ice crystals. Laying between these three main types of clouds are other types like the .stratocumulus., .altocumulus., .cirrocumulus., .altostratus. and .cumulonimbus. clouds. What does quickly rising warm air produce?
Clouds are an essential part of the weather conditions which exist around us. Warm air rises upwards in the atmosphere carrying with it dust and moisture from evaporated surface water. At higher altitudes the air is cooler and the vapour in the warm air reaches its .dew point. where it changes either to small particles of ice or into water, thus forming clouds. Since cloud formation takes place at different heights and temperature, clouds are of different types. There are basically three main types of clouds. Up to about 1-5km from the ground we generally see the first type called the .stratus. cloud, on occasions it is the grey stratus clouds which bear light rain. In colder areas the water in these clouds freezes, thus resulting in snowfall. Slowly rising warm air produces these clouds. Above these and up to about 4-5 km lie the .cumulus. clouds, the fluffy shapes are a result of quickly rising warm air. Above the cumulus clouds, at an altitude of about 14 km, float the .cirrus. types of clouds. Cirrus clouds are wispy clouds formed at such a high altitudes that they contain only ice crystals. Laying between these three main types of clouds are other types like the .stratocumulus., .altocumulus., .cirrocumulus., .altostratus. and .cumulonimbus. clouds. What does quickly rising warm air produce?
A
Cumulus clouds
B
Altocumulus clouds
C
Stratus clouds
D
Altostratus clouds
Clouds are an essential part of the weather conditions which exist around us. Warm air rises upwards in the atmosphere carrying with it dust and moisture from evaporated surface water. At higher altitudes the air is cooler and the vapour in the warm air reaches its .dew point. where it changes either to small particles of ice or into water, thus forming clouds. Since cloud formation takes place at different heights and temperature, clouds are of different types. There are basically three main types of clouds. Up to about 1-5km from the ground we generally see the first type called the .stratus. cloud, on occasions it is the grey stratus clouds which bear light rain. In colder areas the water in these clouds freezes, thus resulting in snowfall. Slowly rising warm air produces these clouds. Above these and up to about 4-5 km lie the .cumulus. clouds, the fluffy shapes are a result of quickly rising warm air. Above the cumulus clouds, at an altitude of about 14 km, float the .cirrus. types of clouds. Cirrus clouds are wispy clouds formed at such a high altitudes that they contain only ice crystals. Laying between these three main types of clouds are other types like the .stratocumulus., .altocumulus., .cirrocumulus., .altostratus. and .cumulonimbus. clouds. What do cirrus clouds contain?
Clouds are an essential part of the weather conditions which exist around us. Warm air rises upwards in the atmosphere carrying with it dust and moisture from evaporated surface water. At higher altitudes the air is cooler and the vapour in the warm air reaches its .dew point. where it changes either to small particles of ice or into water, thus forming clouds. Since cloud formation takes place at different heights and temperature, clouds are of different types. There are basically three main types of clouds. Up to about 1-5km from the ground we generally see the first type called the .stratus. cloud, on occasions it is the grey stratus clouds which bear light rain. In colder areas the water in these clouds freezes, thus resulting in snowfall. Slowly rising warm air produces these clouds. Above these and up to about 4-5 km lie the .cumulus. clouds, the fluffy shapes are a result of quickly rising warm air. Above the cumulus clouds, at an altitude of about 14 km, float the .cirrus. types of clouds. Cirrus clouds are wispy clouds formed at such a high altitudes that they contain only ice crystals. Laying between these three main types of clouds are other types like the .stratocumulus., .altocumulus., .cirrocumulus., .altostratus. and .cumulonimbus. clouds. What do cirrus clouds contain?
A
Water
B
Particles of ice
C
Light rain
D
Ice crystals
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Clouds are an essential part of the weather conditions which exist around us. Warm air rises upwards in the atmosphere carrying with it dust and moisture from evaporated surface water. At higher altitudes the air is cooler and the vapour in the warm air reaches its .dew point. where it changes either to small particles of ice or into water, thus forming clouds. Since cloud formation takes place at different heights and temperature, clouds are of different types. There are basically three main types of clouds. Up to about 1-5km from the ground we generally see the first type called the .stratus. cloud, on occasions it is the grey stratus clouds which bear light rain. In colder areas the water in these clouds freezes, thus resulting in snowfall. Slowly rising warm air produces these clouds. Above these and up to about 4-5 km lie the .cumulus. clouds, the fluffy shapes are a result of quickly rising warm air. Above the cumulus clouds, at an altitude of about 14 km, float the .cirrus. types of clouds. Cirrus clouds are wispy clouds formed at such a high altitudes that they contain only ice crystals. Laying between these three main types of clouds are other types like the .stratocumulus., .altocumulus., .cirrocumulus., .altostratus. and .cumulonimbus. clouds. How are stratus clouds produced?
Clouds are an essential part of the weather conditions which exist around us. Warm air rises upwards in the atmosphere carrying with it dust and moisture from evaporated surface water. At higher altitudes the air is cooler and the vapour in the warm air reaches its .dew point. where it changes either to small particles of ice or into water, thus forming clouds. Since cloud formation takes place at different heights and temperature, clouds are of different types. There are basically three main types of clouds. Up to about 1-5km from the ground we generally see the first type called the .stratus. cloud, on occasions it is the grey stratus clouds which bear light rain. In colder areas the water in these clouds freezes, thus resulting in snowfall. Slowly rising warm air produces these clouds. Above these and up to about 4-5 km lie the .cumulus. clouds, the fluffy shapes are a result of quickly rising warm air. Above the cumulus clouds, at an altitude of about 14 km, float the .cirrus. types of clouds. Cirrus clouds are wispy clouds formed at such a high altitudes that they contain only ice crystals. Laying between these three main types of clouds are other types like the .stratocumulus., .altocumulus., .cirrocumulus., .altostratus. and .cumulonimbus. clouds. Why are there different types of clouds?
The amount of moisture that leather adsorbs or loses is determined by temperature, relative humidity, degree of porosity, and the size of the pores. Moisture has great practical significance because its amount affects the durability of leather, and in articles such as shoes, gloves, and other garments, the comfort of the wearer. High moisture content accelerates deterioration and promotes mildew action. On the other hand, a minimum amount of moisture is required to keep leather properly lubricated and thus prevent cracking. The study indicates that adsorption of moisture by leather is a multi-molecular process and is accompanied by low enthalpies of adsorption. Further 75-percent relative humidity the adsorption is a function of surface area alone. Untanned hide and chrome-tanned leathers have the largest surface areas. The leathers tanned with the vegetable tanning materials have smaller surface areas since they are composed of less hide substance and the capillaries are reduced to smaller diameters, in some cases probably completely filled by tanning materials. This process of tanning occurs due to mutual coagulation of positively charged hide with negatively charged tanning material. The result of the study indicated that untanned hide and chrome-tanned leather adsorb the most water vapour. Assertion: Leather absorbs different amount of moisture. Reason: Some moisture is necessary to prevent cracking of leather.
The amount of moisture that leather adsorbs or loses is determined by temperature, relative humidity, degree of porosity, and the size of the pores. Moisture has great practical significance because its amount affects the durability of leather, and in articles such as shoes, gloves, and other garments, the comfort of the wearer. High moisture content accelerates deterioration and promotes mildew action. On the other hand, a minimum amount of moisture is required to keep leather properly lubricated and thus prevent cracking. The study indicates that adsorption of moisture by leather is a multi-molecular process and is accompanied by low enthalpies of adsorption. Further 75-percent relative humidity the adsorption is a function of surface area alone. Untanned hide and chrome-tanned leathers have the largest surface areas. The leathers tanned with the vegetable tanning materials have smaller surface areas since they are composed of less hide substance and the capillaries are reduced to smaller diameters, in some cases probably completely filled by tanning materials. This process of tanning occurs due to mutual coagulation of positively charged hide with negatively charged tanning material. The result of the study indicated that untanned hide and chrome-tanned leather adsorb the most water vapour. Assertion: Vegetable tanned leather cannot adsorb a large amount of moisture. Reason: Porous materials have higher surface area.
The amount of moisture that leather adsorbs or loses is determined by temperature, relative humidity, degree of porosity, and the size of the pores. Moisture has great practical significance because its amount affects the durability of leather, and in articles such as shoes, gloves, and other garments, the comfort of the wearer. High moisture content accelerates deterioration and promotes mildew action. On the other hand, a minimum amount of moisture is required to keep leather properly lubricated and thus prevent cracking. The study indicates that adsorption of moisture by leather is a multi-molecular process and is accompanied by low enthalpies of adsorption. Further 75-percent relative humidity the adsorption is a function of surface area alone. Untanned hide and chrome-tanned leathers have the largest surface areas. The leathers tanned with the vegetable tanning materials have smaller surface areas since they are composed of less hide substance and the capillaries are reduced to smaller diameters, in some cases probably completely filled by tanning materials. This process of tanning occurs due to mutual coagulation of positively charged hide with negatively charged tanning material. The result of the study indicated that untanned hide and chrome-tanned leather adsorb the most water vapour. Assertion: Adsorption of moisture by leather is physisorption. Reason: It is a multimolecular process and is accompanied by low enthalpies of adsorption
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