Chemical Engineering

Generally enthalpy is analgous to the energy of a material at a particular temperature and pressure. It is calculated to determine the energy a material holds, or more often, enthalpy differences are calculated to determine how much energy is required to bring a material from one temperature and pressure to another temperature and pressure.

yes.

Dynamite was invented by the Swedish chemist Alfred Nobel in 1867.

When high temperatures may damage a heated fluid and heating requirements are low enough that can be met by the heating media temperature. Cocurrent flow heat transfer has lower heating (or cooling) capacity than counterflow and there is a theoretical cocurrent flow temperature limit achievable which is lower in heating (or higher in cooling) than the temperature achievable in counterflow.

the most effective way to do so is to reduce the flow of the heat exchanger

Application of this law involve supplementary costs for installations, materials, treatment of wastes, workers.

no it can not

what is annual salary of an orthopaedic surgeon in dubai

Yes, it is correct.

As the reflux minimizes and heat energy remains to same that time sudden increase in pressure drop takes place.

As the vapour flow is higher compared to liquid flow so liquid is unable to comes down through downcomer and flooding occurs......

A rate-governed or rate-limiting process is a process in which there are several steps; however, the rate of one or more steps is much slower than all the others. The rates of the previous steps and following steps are assuming to be infinite, and the rate of the process only depends on the rate-limiting step(s).

carbons that are covelently bonded together in hexagonal form to make a thin tube as strong as diamonds, lighter then steal and as thin as a human hair strand

How to prepare coolant for machineries and the formula for coolant

it is the pressure test used to determine the operating pressure of the pressure relief valves (CDTP).

a cotton seed is no simple molecule but a complex living compound

Pitting potential is the potential where the pitting start and this is noticed when the current is suddenly increased that also mean below this value, now pitting corrosion will initiate

Many parameters can effluence the pitting potential such as Temperature, halides ions, surface finishing of the alloy and also state of the electrolyte , is it flowing or stagnant.

MolSieve 3A
System diagram is on page 3 of this link
http://www.c-a-m.com/cam/search/showdocw.cfm?DOCUMENT_ID=8547

The first thing to do is to remove the rust. You will need to use heat resistant paint. Most stores sell a heat or stove paint that works well.

Derivative control applied in control engineering, usually for the operation of control valves and its importance came during valve tuning.

Derivative control is popularly known as anticipatory control. ( controller starts its control action, by anticipating the trend of present value (PV) of parameter.) Derivative control anticipates parameter values and and it will take control action to control the parameter with in set point.

Eg: In a water heating system, water temperature is controlled by controlling steam valve opening. Let set point for water is 80°C, and derivative control will check the status of water temperature and if it is slowly increasing range ( may be due to some load change), controller will starts to control temperature by slowly closing steam valve. ( and vice versa) Actually this type control action just observe at control parameter values and initiates control action.

In chemical engineering terms, sedimentation refers to the tendency for the particles in suspension to settle out of the fluid in which they are entrained, and come to rest against a barrier. This is due to their motion through the fluid in response to the forces acting on them: these forces can be due to gravity, centrifugal acceleration or electromagnetism.

Carborundum and Granite are materials commonly used in the manufacture of grinding wheels & disks, although modern polymers such as silicone (in its various guises) are also used to aid the cohesion of the wheel. In grinding and cutting disks there is usually a fibre matrix of some kind. This helps prevent the disk shattering when exposed to load. Making ones own high speed grinding wheels is not a task for the layman. While it IS possible, it should be born in mind that such wheels need to be perfectly ballanced in order to be safe for use. There are many industrial standards when it comes to these tools, not least of which being the Kite mark and CE mark. The standards are in place for very good reasons. A poorly made grinding wheel is liable to shatter or even explode when placed under load. Where larger wheels are concerned, an incident such as this could prove fatal to both the operator and any by-standers.

Drano rots some products, but also jellifies others. It is not a good drain cleaner. To find better products go your plumbing wholesaler.

In order for a high temperature boiler or steam engine to produce superheated water, or steam?

The scope is to obtain pure chemical products.

There are many different kinds of alcohol, and each has its own boiling point. Here are just the first two: Methyl alcohol, (methanol) - B.P. = 64.7 °C, 148.5 F° (337.8 K) Ethyl alcohol (ethanol) - B.P. = 78.4 °C, 173.1 F° (351.6 K)

Yes, you can find it in many brands. Check in the plumbing section of your local hardware store. ~$5 will buy a stick that will make a ball about the size of a hen's egg. I just applied a (rather ridiculously large) temporary patch to a cast iron waste line last week. It is still holding and I may just leave it as a permanent patch if it survives another week. The key to good adhesion is to make sure the surface is utterly clean and dry. Some putties may advertize that you can apply them to a wet surface--you can try but you'll likely be disappointed with the results. All epoxy putties cure waterproof and, since they do not dissolve in water, they can be considered non-toxic. Read the manufacturer's warning label and the MSDS if it is available. Another place to look is your local automotive parts store. They will likely sell epoxy putties for patching radiators.