Bomb calorimeter, Biology

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

Posted Date: 7/12/2012 2:14:57 AM | Location : United States







Related Discussions:- Bomb calorimeter, Assignment Help, Ask Question on Bomb calorimeter, Get Answer, Expert's Help, Bomb calorimeter Discussions

Write discussion on Bomb calorimeter
Your posts are moderated
Related Questions
What mode of nutrition did lizard exihbite

What is the connection between tissue fluid, plasma and lymph? Tissue fluid is plasma (minus its proteins) which has leaked out of the capillaries. Lymph is tissue fluid which

State three conditions in a society which could contribute to a reduction in the birth rate. Birth rate might be decreased by (i) later marriages (as smaller families), (

Define Most Probable Number (MPN) Method? The MPN method is like agar shake tube method where no agar is used. The dilutions of the microbial suspension are made in liquid medi

how atoms are arranged to work in DNA?

Explain Iron Uptake by Cells? Iron participates in a large number of biochemical reactions. However, for iron to perform any function, it first needs to be taken up by the cell

SUPERNUMERARY OR ACCESSORY CHROMOSOMES Wilson (1905) discovered them in Matapodium insect. Very small Chromosomes present in nucleus in addition to normal number of Chr

Q. Aortic regurgitation by Cardiac Catheterization? Often cardiac catheterization is not indicated as reliable information for management decision making can be obtained throug

Discuss about electric field The electric field is a vector quantity whose magnitude is the force per unit charge and points in the direction of the force on the positive test

Neuron A is a healthy neuron with all the usual ion channels.  When at rest with a membrane voltage of R millivolts, neuron A produces no action potentials.  The voltage thresh