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SOIL SPECIFIC GRAVITY | PYCNOMETER METHOD पिकनोमीटर की सहायता से मृदा कणों का आपेक्षित गुरुत्व ज्ञात करना

ByCivil Guru

PYCNOMETER METHOD | SPECIFIC GRAVITY OF SOIL

SOIL SPECIFIC GRAVITY | PYCNOMETER  METHOD  

 पिकनोमीटर की सहायता से मृदा का आपेक्षिक गुरुत्व ज्ञात  करना 

I.S. CODE: [2720 part 3-(SEC-2)-1980]

  • Purpose(उद्देश्य ) :-

          SOIL SPECIFIC GRAVITY by PYCNOMETER METHOD,पिकनोमीटर की सहायता से मृदा का आपेक्षिक गुरुत्व ज्ञात  करना |

  1. pycnometer
  2. 0.01% सुग्राही  (sensitive)  तुला
  3. distil water ( आसुत जल )
  4. 4.75 mm IS चालनी
  • Soil sample (मृदा नमूना ) :- 

मृदा(soil) के नमूने  को भट्टी (oven) मैं निशचित ताप पर रखकर सुखा लो और 4.75 mm चालनी से छान लो यदि मृदा कणों के विशिष्ट गुरुत्व (specific gravity) का मान HYDROMETER  विशलेषण के लिए अवश्यकता हो तो 2.0 mm IS चालनी  से छानना चाहिए 500 ML  वाले  (pycnometer) पिकनोमीटर के लिए कम से कम 100 gm मृदा का नमूना लेना चाहिए |

  • Principle (सिद्धांत ) :- 

 निशचित आयतन के मृदा कणों का निशचित ताप पर वायु मैं भार तथा उसी ताप पर सामान्य आयतन के असुत(distill water) जल जल भार काअनुपात मृदा कणों का  आपेक्षिक/विशिष्ट  गुरुत्व कहलाता है |

विशिष्ट\quad गुरुत्व\quad \quad (G)=[\frac { (W2-W1) }{ (W2-W1)-(W3-W4) } ]
  • Method (विधि):- 
  1. पिकनोमीटर  को साफ़ करके तोल लें
  2. अब पिकनोमीटर  मैं मृदा (SOIL) की मात्रा को रखकर तोल लें
  3. पिकनोमीटर में थोडा आसुत जल डाल कर अच्छी प्रकार हिला लो ताकि मिट्टी से वायु निकल जाये। आवश्यकता पड़ने पर मृदा को थोड़ा गर्म भी किया जा सकता है या वायु चूषक पम्प (Air suction pumps) का भी उपयोग किया जा सकता है।
  4. पिकनोमीटर में मृदा-जल मिलाकर उसे ऊपर तक पूरा पानी से भर कर तौल लो। पिकनोमीटर से मृदा-जल का मिश्रण निकाल कर प्रधान को धोकर साफ कर पाछ कर आसुत जल से भरकर तौल लो।
  • Observation (प्रेक्षण) :-
 S.Rपात्र संख्या       I II   III
1खाली पिकनोमीटर  का भार  =  (W1 ) gm    100
2पिकनोमीटर + गीली मृदा का भार   = (W2 ) gm    280
3पिकनोमीटर + शुष्क  मृदा का भार = (W3) gm    220
4मृदा ( SOIL) में जल की मात्रा = (W4)gm    60
5मृदा कणों का विशिस्ट गुरुत्व G=2.7    2.7
6(w)=[(\frac { W2-W1 }{ W3-W4 } )(\frac { G-1 }{ G } )-1]\times 10029.10%

इसी प्रकार DEAR FRDS आप दूसरी और तीसरी READING निकालकर देखिये और COMMENT section मैं ANSWER बताएं |

  • Results (परिमाण ):-
  1. प्रयोगशाला ताप पर मृदा कणों का विशिष्ट  गुरुत्व GT =[\frac { (W2-W1) }{ (W2-W1)-(W3-W4) } ]
  2. ताप के लिए शुद्दिकरण गुणांक ( CORRECTION FACTOR) KT =\frac { (जल\quad का\quad प्रोगशाला\quad के\quad ताप\quad पर\quad आ०घ०) }{ (जल\quad का\quad 27°C\quad ताप\quad पर\quad आ०घ०) } ]
  3. मृदा कणों का 27°C पर विशिष्ट  गुरुत्व ⌈G= G x  KT⌋

मृदा का जलांश w=? % हे|

  • Precautions (सावधानियाँ ):-
  1. शुष्क मृदा का भार , भार स्थिर होने पर ही लेना चाहिए
  2. सभी भार सबधानी से लेने चाहिए
  3. तीसरी व चोथी READING मैं पिकनोमीटरपूरा जल से भरा होना चाहिए |

dear frds यह article आपको कैसा लगा pls comment करके जरूर बताएं

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