Weather Instruments: Thermometer, Barometer, Anemometer, Rain Gauge, Stevenson Screen| Geography
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Thermometer is used to measure air temperature. Most thermometers are in the form of a narrow closed glass tube with an expanded bulb at one end. The bulb and the lower part of the tube are filled with liquid such as mercury or alcohol. Before the other end is sealed off, the air in the tube is released by heating it.
Celsius - melting ice is marked 0 degree C and that of boiling water as 100 degree C, and the interval between the two is divided into 100 equal parts
On the Fahrenheit thermometer, the freezing and boiling points of water are graduated as 32 degree F and 212 degree F respectively
While the maximum thermometer and minimum thermometer are used to measure the air temperature, the dry bulb and the wet bulb thermometers are used to determine the humidity in the air. A set of these thermometers is kept in the Stevenson Screen.
The maximum thermometer is designed to record the highest temperature during a day. As the temperature increases, the mercury moves up into the tube; however, as the mercury cools, it cannot move downwards because of a constriction in the tube. It must be reset again to bring it down
Minimum thermometer - In this thermometer, alcohol is used in place of mercury. When the temperature decreases, the metal pin in the tube goes down and strikes at the minimum temperature.
The Stevenson screen is designed to protect thermometers from precipitation and direct sunlight while allowing air to circulate freely around them. It is made from wood with louvered sides to allow free and even flow of air. It is painted white to reflect radiation. It stands on four legs and is about 3 feet 6 inches above the level of the ground. The legs must be sufficiently rigid and be buried sufficiently in the ground to prevent shaking. The front panel is hinged at the bottom to form a door, which allows for maintenance and reading of the thermometers. The door of Stevenson screen is always towards the north in the northern hemisphere and towards the south in the southern hemisphere because direct sunrays also affect mercury. The purpose of the Stevenson screen is to create a uniform temperature enclosure that closely represents the same temperature as the air outside
Chapters:
0:00 Weather Instruments
1:02 Temperature
2:11 Max and Min Thermometers
4:38 Stevenson Screen
5:32 Humidity
6:28 Wet & Dry Bulb Thermometers
8:28 Pressure
11:19 Rain Gauge
12:58 Sundial
13:28 Wind Vane
15:27 Anemometer
18:01 Isobars, Isohels, Isonephs, Isohyets and Isotherms
#weatherinstruments #temperature #maxandminthermometers #stevensonscreen #humidity #wetanddrybulbthermometers #pressure #raingauge #sundial #windvane #anemometer #isobarsisohelsisonephsisohyetsandisotherms #examrace #examrace #upsc #ugcnet
For IAS Prelims visit https://www.doorsteptutor.com/Exams/I...
For GS test series refer - https://www.doorsteptutor.com/Exams/I...
IAS Mains Geography optional postal course visit - http://www.examrace.com/IAS/IAS-Flexi...
NTA-NET Geography - https://www.examrace.com/NTA-UGC-NET/...
Geography Optional recorded lectures covering complete syllabus in most systematic form - https://www.doorsteptutor.com/Exams/I...
Join our fully evaluated UPSC Geography optional test series at - https://www.doorsteptutor.com/Exams/I...
For Maps and locations (revised and updated - includes section on education, defense and more) book click here - http://www.examrace.com/IAS/IAS-Flexi...
NTA NET Geography practice questions - https://www.doorsteptutor.com/Exams/U...
Practice and Prepare @ https://www.doorsteptutor.com/
Lectures on Various Subjects like Science, Social Studies and Humanities subscribe testprep
Examrace Lectures in Hindi subscribe examracehindi
For kids videos nursery to Class 5 subscribe funprof
For Science (Physics, Chemistry, Biology and Mathematics) Class 11-12 and important topics subscribe doorsteptutor
Also visit
NCERT Solutions, NIOS @ https://www.flexiprep.com/
IGCSE, A & AS Level @ https://www.examtestprep.com/
Thermometer is used to measure air temperature. Most thermometers are in the form of a narrow closed glass tube with an expanded bulb at one end. The bulb and the lower part of the tube are filled with liquid such as mercury or alcohol. Before the other end is sealed off, the air in the tube is released by heating it.
Celsius - melting ice is marked 0 degree C and that of boiling water as 100 degree C, and the interval between the two is divided into 100 equal parts
On the Fahrenheit thermometer, the freezing and boiling points of water are graduated as 32 degree F and 212 degree F respectively
While the maximum thermometer and minimum thermometer are used to measure the air temperature, the dry bulb and the wet bulb thermometers are used to determine the humidity in the air. A set of these thermometers is kept in the Stevenson Screen.
The maximum thermometer is designed to record the highest temperature during a day. As the temperature increases, the mercury moves up into the tube; however, as the mercury cools, it cannot move downwards because of a constriction in the tube. It must be reset again to bring it down
Minimum thermometer - In this thermometer, alcohol is used in place of mercury. When the temperature decreases, the metal pin in the tube goes down and strikes at the minimum temperature.
The Stevenson screen is designed to protect thermometers from precipitation and direct sunlight while allowing air to circulate freely around them. It is made from wood with louvered sides to allow free and even flow of air. It is painted white to reflect radiation. It stands on four legs and is about 3 feet 6 inches above the level of the ground. The legs must be sufficiently rigid and be buried sufficiently in the ground to prevent shaking. The front panel is hinged at the bottom to form a door, which allows for maintenance and reading of the thermometers. The door of Stevenson screen is always towards the north in the northern hemisphere and towards the south in the southern hemisphere because direct sunrays also affect mercury. The purpose of the Stevenson screen is to create a uniform temperature enclosure that closely represents the same temperature as the air outside
Chapters:
0:00 Weather Instruments
1:02 Temperature
2:11 Max and Min Thermometers
4:38 Stevenson Screen
5:32 Humidity
6:28 Wet & Dry Bulb Thermometers
8:28 Pressure
11:19 Rain Gauge
12:58 Sundial
13:28 Wind Vane
15:27 Anemometer
18:01 Isobars, Isohels, Isonephs, Isohyets and Isotherms
#weatherinstruments #temperature #maxandminthermometers #stevensonscreen #humidity #wetanddrybulbthermometers #pressure #raingauge #sundial #windvane #anemometer #isobarsisohelsisonephsisohyetsandisotherms #examrace #examrace #upsc #ugcnet
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