Few shots from my drawings :)

These drawings are drawn during my secondary & tertiary school career.

 

 

Is there any difference between Erlenmeyer Flask & Conical Flask?

No,there is no difference between them.
Both are same.
Both are used in many chemical experiments in laboratory such as for titration,for boiling,for chemical mixing and so on.

Erlenmeyer Flask











 Conical Flask

Why do we Standardize a Solution?

Sometimes we should have to standardize Solutions (Reagents) before starting a chemical experiments because,it will allow us to get correct readings during the experiment whereas the exact concentration of the solution could be different.And as well as by standardizing a solution we could minimize the deviation of instrumental errors & random human errors too.Therefore,it is good to standardize and get actual concentration at the initiation of the experiment.

Bulk Modulus (K) for a gas

Average Bulk Modulus = - Change of Pressure/Change of Volume per unit volume

                             = - dP/(dV/V)

                             = - V (dP/dV)

If we keep temperature as constant we called that as isothermal bulk modulus.

Proof of Bulk Modulus (K) for a gas is given by,

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Introduction to Java for Beginners

Java is a programming language done by Sunmicro Systems which is heavily use for web applications,standard application…etc.James Gosling is the founder of the Java.

jdk Software

To work with Java programmes you need to have jdk software.

Version on jdk

1.2, 1.2.1, 1.3, 1.4, 1.5,1.6,...and so on.

Where jdk installed

If you have a jdk 1.5.0 it will create folder on C drive called Java.There you finding the Java software.

Installing jdk 1.5.0 software

jdk 1.5.0 helps you to install Java your computer system by this jdk 1.5.0 work with Java language.

Seting with the Java compliments

Go to the command prompt and seting the Java path.

Seting path temporaly

Go to the command prompt and type like this

Set path=C:\Program Files\Java\jdk1.5.0\bin

Seting path permanantly

Go to the notepad and type Set path=C:\Program Files\Java\jdk1.5.0\bin and save as autoexec.bat on the C drive and restart the machine.

Checking whether path properly set

Type: - C:\path

      PATH= C:\Program Files\Java\jdk1.5.0\bin

1. What will happen if path will upset?

   the error message displaying in the command prompt as " Java

   cannot be recognizing as internal or external command."

2. How do I check whether Java is installed to my computer?

   go to the command prompt then type Java and enter.

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Printing numbers from 0001 to 9999 which will leave out numbers adding up to thirteen | Mathematica Program

The number 13 is traditionally considered to be an unlucky number in many countries. It even has a specifically recognized phobia, Triskaidekaphobia, a word which was coined in 1911. The superstitious sufferers of triskaidekaphobia try to avoid bad luck by keeping away from anything numbered or labeled thirteen. As a result, companies and manufacturers use another way of numbering or labeling to avoid the number, with hotels and tall buildings being conspicuous examples (Thirteenth floor). It's also considered to be unlucky to have thirteen guests at a table. Friday the 13th has been considered the unluckiest day of the month.

And the Colombia Shuttle was sent into space on 16/1/2003.

    1 + 6 + 1 + 2 + 0 + 0 + 3 = 13

The shuttle was exploded during re-entry and all its crew members died.

                                 

So, most Sri Lankans also consider number 13 as unlucky. Hence, the Government of Sri Lanka rejects vehicle registration numbers which add ups to thirteen.

                            i.e. 6412 = 6 + 4 + 1 + 2 = 13

Therefore, following Mathematica Program is to find the numbers from 1 to 9999, which will leave out numbers adding up to thirteen.

Read More >>> Mathematica Report