Bomb calorimeter, Biology

Assignment Help:

Bomb calorimeter is used to determine the calorific value of solid and liquid fuels.

Construction

         It consists of following parts

1.      Stainless steel bomb: here, the combustion of fuel takes place. The bomb has a lid, which can be made gas tight by means of screws. The lid consists of two electrodes and an oxygen inlet valve. To one of the electrodes, a small ring is attached to support a nickel or stainless steel crucible. Fuel is taken in the crucible. Magnesium wire touching the fuel sample is stretched across the electrodes. Bomb is capable to with stand high pressure (25 - 50 atm). It is lined inside with platinum so that it resists corrosion.

2.      Copper calorimeter: the stainless steel bomb is placed in a copper calorimeter containing known amount of water.

3.      Air jacket/water jacket: copper calorimeter is surrounded but an air jacket and a water jacket to prevent heat losses due to radiation.

4.      Beckmann's thermometer: the copper calorimeter is provided with a Beckmann's thermometer, which can read accurately a temperature difference upto 1/100th of a degree.

5.      Stirrer:  the copper calorimeter is provided with an electrically operated stirrer.

Working

         A known amount of fuel whose calorific value is to be determined is placed in crucible. Magnesium wire touching the sample is stretched across the electrodes. Bomb is filled with oxygen through oxygen value and a pressure of 25 - 30 atm. is maintained. Bomb is then kept in a copper calorimeter containing known amount of water. Temperature of water is noted. The fuel is ignited by connecting electrodes to the battery. The fuel burns and the energy liberated increases the temperature of water in the calorimeter. Water is stirred with the stirrer and the maximum temperature attained is noted. The calorific value of the fuel is calculated as follows:

         Weight of fuel sample taken = x gm

         Weight of water taken in calorimeter = W gm

                     Higher calorific value = L cal/gm.

         Water equivalent of calorimeter = W gm.

         Initial temperature of water in calorimeter = t 1 0C


Related Discussions:- Bomb calorimeter

Interspecific competition, Darwin while evolving the concept of natural sel...

Darwin while evolving the concept of natural selection laid emphasis on competition among individuals belonging to a species, that is intraspecific competition. Here the individual

Explain the behaviour of pteridophytes, Q. Why are pteridophytes better ada...

Q. Why are pteridophytes better adapted to dry land than bryophytes? Were pteridophytes always less abundant than phanerogamic plants? Although pteridophytes and bryophyt

Explain the types of carrageenan, Explain the types of Carrageenan It ...

Explain the types of Carrageenan It was first produced commercially from the red algae, Chandrus crispus, found along the northeast shores of the U.S and Canada and referred t

Evolution and scope of dental implantology, The need to replace missing tee...

The need to replace missing teeth has haunted humans for time immemorial. Since antiquity man has attempted to solve the problems associated with failing dentition. The goal of mod

What are the glucagon receptors in the plasma membranes, Which of the follo...

Which of the following serves as an effector, or as part of an effector, that functions in a negative feedback system? A. Glucagon Receptors in the plasma membranes of alpha-is

Explain the physiology of lactation, Explain the Physiology of Lactation? ...

Explain the Physiology of Lactation? Lactogenesis is the onset of copious milk secretion around parturition, triggered by a fall in plasma progesterone levels. Although some co

Telophase of karyokinesis, - The chromosomes at each pole uncoil and elonga...

- The chromosomes at each pole uncoil and elongate to form the chromatin. - A nucleolus reappears at each pole. - Spindle fibers and asters disappear and centrioles split. - A nu

Describe shunts, Q. Describe Shunts? Detection, localization and quanti...

Q. Describe Shunts? Detection, localization and quantification of intracardiac shunts are one of the most important exercises in cardiac catheterization. In most cases a prelim

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd