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 ?Which digital marketing course is best One day i were visiting my friend robert i found him so sad i asked him why are you sad  ?? he told me that his father lost his job and can't work again after accident his father worked as sales man in big company and now he don't have any job . my friend asked me what should he do for him to help him ? i told him there is a great solution to that problem . my friend asked in surprise what is it tell me ? i answered digital marketing is the greatest solution for that problem he surprised again and said digital marketing ?! I said  yeah and the best course in digital marketing you well found in the internet  is nano-degree from udacity.  why  nano-degree form udacity is the best  course  in that field ?? because nano-degree form udacity  helps you to start from zero to be a hero in digital marketing it well teach you the strategies  of digital marketing ,content strategies ,...

ازاله تجاعيد الوجه ياستخدام الفوتوشوب كيفيه ازاله تجاعيد الوجه باستخدام الفوتوشوب بطريقه سهلة و احترافيه لاتفوتك

الطاقه الشمسيه و تطبيقاتها الطاقة الشمسية " و" تطبيقات الطاقة الشمسية ". فتطبيقات الطاقة الشمسية عديدة ومتنوعة وأكثر من أن نحصيها وقابلة للزيادة مع مرور الوقت. ولكي نفهم هذا الفارق ساضرب لكم مثالا بسيطا " اذا سألتك ما هي استخدامات المصباح الكهربي؟ ستجاوبني بانه يستخدم للانارة. ولكن اذا سألتك ما هي تطبيقات المصباح الكهربي؟ ستجد انه يمكن ان يستخدم في انارة المنزل او انارة الشوارع او ان يكون كشافا تحمله في يدك والكثير والكثير." وبالمثل اذا تحدثنا عن استخدامات الطاقة الشمسية سنجد أن الشمس تمدنا بنوعين من الطاقة لا ثالث لهما وهما الطاقة الضوئية " فوتونات الضوء" والطاقة الحرارية. استخدامات الطاقة الشمسية الكهربية والحرارية  - فالطاقة الشمسية الحرارية يمكن استغلالها بواسطة أجهزة ابتكرها البشر لتلبية استخدامات مختلفة : - تسخين المياه بواسطة السخانات الشمسية هو أحد ا هم واقدم استخدامات الطاقة الشمسية الحرارية والتي دخل عليها العديد من التطورات في العقد الأخير وهذه السخانات لها العديد من الانواع والأشكال والتطبيقات ولكننا كما ذكرنا فاننا نتحدث الآن عن الأس...

Optical Isomerism in Organic Molecules What are stereoisomers? Isomers are molecules that have the same molecular formula, but have a different arrangement of the atoms in space. That excludes any different arrangements which are simply due to the molecule rotating as a whole, or rotating about particular bonds. Where the atoms making up the various isomers are joined up in a different order, this is known as structural isomerism. Structural isomerism   is   not   a form of stereoisomerism, which involve   the atoms of the complex bonded in the same order, but in different spatial arrangements. Optical isomerism is one form of stereoisomerism;   geometric isomers   are a second type.. Optical isomerism Optical isomers are named like this because of their effect on plane polarized light. Simple substances which show optical isomerism exist as two isomers known as enantiomers. ·          A solution of one enantiome...

The Properties of Oxygen Gas Oxygen is one of the most abundant elements on this planet. Our atmosphere is 21% free elemental oxygen. Oxygen is also extensively combined in compounds in the earths crust, such as water (89%) and in mineral oxides. Even the human body is 65% oxygen by mass. Free elemental oxygen occurs naturally as a gas in the form of diatomic molecules, O2 ( g ).  Oxygen exhibits many unique physical and chemical properties. For example, oxygen is a colorless and odorless gas, with a density greater than that of air, and a very low solubility in water. In fact, the latter two properties greatly facilitate the collection of oxygen in this lab. Among the unique chemical properties of oxygen are its ability to support respiration in plants and animals, and its ability to support combustion. In this lab, oxygen will be generated as a product of the decomposition of hydrogen peroxide. A catalyst is used to speed up the rate of the decompo...