What is aqueous solution?

An aqueous solution is a solution in which the solvent is water. It is usually shown in chemical equations by appending (aq) to the relevant
chemical formula. For example, a solution of table salt , or sodium chloride (NaCl), in water would be represented as NaCl(aq). The word
aqueous means pertaining to, related to, similar to, or dissolved in water. As water is an excellent solvent and is also naturally abundant, it is a ubiquitous solvent in chemistry .

যন্ত্রকৌশল সঙ্গীত

        ----  যন্ত্রকৌশল সঙ্গীত-----
         সাইফুল ইসলাম মজুমদার
         এম ই ১/২ (B),  ডুয়েট

"মোরা উদ্যম, মোরা দুর্দম
মোরা ধাবমান, মোরা অাবহমান।
মোরা যন্ত্রকে করি গতিদান।।"-১

নীল অাকাশের ওই কালো মেঘ কেটে,
উড়ে যায় অগ্রগামী উড়োযান।
মানুষের তরে এই সভ্যতা অাজো অাবহমান...
"যুগের তরী মোরা বয়ে চলি,
কেটে জল কল কল,
বিশ্বের তরে অামাদের যন্ত্র প্রকৌশল।।"-২
................১...........

টারবাইনের পাখায় মোরা শক্তির জয়গান,
বয়লারের বাষ্পে অাজ, 
সমাজের রেলগাড়ি চলমান।
ডিজেল ইঞ্জিনের জলন্ত শিখা মোরা,
মোরা দিপ্তিমান।
..................১..............

কৃষকের তরে মোরা বিধাতার দান,
কারখানার চাকা প্রতিনিয়ত ঘুর্নায়মান।
অামরা যত নব প্রযুক্তির ঘামে ভেজা অভিধান,
চল সবাই মিলে গাই নব সৃষ্টির জয়গান।।
................১................
....................২..............

What is Heat?

Heat is energy transferred between a system and its surroundings as a result of
a temperature difference. Energy that passes from a warmer body (with a higher
temperature) to a colder body (with a lower temperature) is transferred as heat.
At the molecular level, molecules of the warmer body, through collisions, lose
kinetic energy to those of the colder body. Thermal energy is transferred—“heat
flows”—until the average molecular kinetic energies of the two bodies become
the same, until the temperatures become equal. Heat, like work, describes
energy in transit between a system and its surroundings.

Not only can heat transfer cause a change in temperature but, in some
instances, it can also change a state of matter. For example, when a solid is heated,
the molecules, atoms, or ions of the solid move with greater vigor and eventually
break free from their neighbors by overcoming the attractive forces between
them. Energy is required to overcome these attractive forces. During the process
of melting, the temperature remains constant as a thermal energy transfer (heat)
is used to overcome the forces holding the solid together. Aprocess occurring at a
constant temperature is said to be isothermal. Once a solid has melted completely,
any further heat flow will raise the temperature of the resulting liquid.
Although we commonly use expressions like “heat is lost,” “heat is gained,”
“heat flows,” and “the system loses heat to the surroundings,” you should not
take these statements to mean that a system contains heat. It does not. The
energy content of a system, as we shall see in Section 7-5, is a quantity called
the internal energy. Heat is simply a form in which a quantity of energy may be
transferred across a boundary between a system and its surroundings.
It is reasonable to expect that the quantity of heat, q, required to change the
temperature of a substance depends on
• how much the temperature is to be changed
• the quantity of substance
• the nature of the substance (type of atoms or molecules)

Collected by, shaiful islam majumder
Mechanical engineering, 1/2
Dhaka university of Engineering and Technology-DUET

Wiley: Accounting Principles, 11th Edition - Jerry J. Weygandt, Paul D. Kimmel, Donald E. Kieso

Wiley: Accounting Principles, 11th Edition - Jerry J. Weygandt, Paul D. Kimmel, Donald E. Kieso

Equation Of Life

Life is a Complex Equation, where D is A Unknown
variable! (D= Dream)
And x is a Targeted variable. (x=Number of season like,
1=Child, 2= pre Adult 3=young & 4= old)
L=Life
here, Dream is constant
So, Equation of life Life,

L =Limit  (Birth→die), x→1/2/3/4
∑ f( 10+x^3)+ D

Diagram of Iron-Carbon equilibrium

This is an real hand scratch of engg.shaiful islam majumder . 

The real iron -carbon equilibrium showd on picture with Eutectic and Eutectoid point include Temperature (selcious).

Law of Archimedes

Any object in the pool of liquid float arkimedisera sources discovered crack
 1. Floating object.
 II. Submerged object.

1: floating object floating sutrah object if a liquid condition
 "The Sinking of the entire object, the object of the total mass = volume of same external fluid mass".
If the floating mass of the displaced fluid mass of the object is greater than or equal to the Met. It is kept in the mass of the object with a solid volume concentration  portion refers to the portion of the volume of the fluid volume of the object, the greater the volume along the fluid density Product outer volume. When the weight / mass of the object, then you'll find there is a blank portion will be calculated by deducting the portion of the fluid to calculate the mass of an object submerged in volume estimation Exterior'll just, you do not need to remove the object is empty Co ..

 II. In case of sinking "dipped in liquid, resulting in loss of weight or volume of the fluid mass is equal to the total area ploating = object".
We usually find that anything can carry the water dobale takes light than before. Yet! Mass of the object is reduced to nothing. Light is then why ????
Because of this Light to an object in a fluid is the mass of the water to be floated on the liquid basabatura urdbamukhi a force. This ball plabata the fluid. Of water on an object is equal to the weight loss plabata the object means to lose weight because plabatai object. This is the total volume plabatara manata samaayatanera fluid density solutions with fluid. When the object is submerged kicuta space he occupied. This was a mass of occupied space and the amount of liquid. The mean value of the object on the object of the plabatara the bharatai losing weight!