Sciece and Technology Point

Purity Test of Purified Water Requirement : Test tube, test tube holder, test tube rack, labeling materials (pen, paper, scissors, gum).  Reagent : Litmus paper (red and blue), BaCl 2 , AgNO 3 , Ammonium Oxalate, NH 4 OH, Nessler's Reagent, Sodium Sulfide, Ingredients: Supplied purified water.  Procedure: Experiment 1: Some amount of purified water is taken in a test tube.  Observation : Clean, colorless, odorless. Inference : May be pure. Experiment 2: Litmus Test: Some amount of purified water is taken in a clean test tube. (a) A blue litmus paper is dipped into the solution. (b) A red litmus paper is dipped into the solution.  Observation : (a) The colour of blue litmus paper is not changed. (b) The colour of red litmus paper is not changed. Inference : (a) Absence of Acid. (b) Absence of alkali. Experiment 3: Some amount of purified water is taken in a test tube. Few ...

Purity test of Sugar of Milk Requirement : Test tube, test tube holder, test tube rack, labeling materials (pen, paper, scissors, gum).  Reagent : Litmus paper (red and blue), Iodine solution.   Ingredients: Sugar of milk and purified water . Procedure: Experiment 1: Some amount of sugar of milk is taken in the fingers and is poured on the tongue. Observation : Colour: milky white Smell: Odorless Taste: Faintly sweet Feeling in touch: Crystalline powder  Inference : May be pure. Experiment 2: Some amount of sugar of milk is taken in a clean test tube. Then, 5 times of its (sugar of milk taken test tube) bulk of water is mixed with it. Then gentle shaking is done until the sugar of milk is fully dissolve.  Observation : Clear odorless solution without any sediment is formed. Inference : May be pure. Experiment 3: Litmus Test: Some amount of sugar of milk is taken in a clean te...

We often go to market and buy many things. When we buy small amount of loose commodity (i.e. without package) e.g. Fish, vegetable etc. , we are to calculate price in short time. Some people can't easily calculate the price, even some are get confused. In this article, we learn how to calculate the price of small quantity of unpacked food items or other commodity.  What I shall teach you, is not a different thing but is mathematics. Basically, I tell you a easy, handy approach, so that you can use that in market. First, I tell you the rule and then I explain the rule with few example.  Rule: If we know the price of 1kg, Price of 100g=(Price of 1kg/10) i.e. Put decimal point after 1 digit from right side. Price of 10g=(Price of 1kg/100) i.e. Put decimal point after 2 digit from right side. Price of 1g=(Price of 1kg/1000) i.e. Put decimal point after 3 digit from right side. If the Price of 1kg of a thing is 160.  Then, Price of 100g=16.0 Pric...

Rule of 72 or Rule of 70 or doubling rule is a well known rule in finance. In this post, we first see how this rule works and from where it is derived.  Rule of 72 or Rule of 70 : If a capital is invested and compounded at the rate of r %/year , it will be doubled (2P) approximately in (70/r) years or (72/r) years.  For example, if a capital 100 is invested and compounded at the rate of 10%/year, it would be doubled approximately in (70/10)years or (72/10) years i.e. 7 years or 7.2 years. i.e. if a capital 100 is invested and compounded at the rate of 10%/year, it will be doubled i.e . 200 approximately in 7 years or 7.2 years.  NOTE : The time derived from Rule of 70 or Rule of 72 is a approximation. Of course, a good approximation i.e. it is very closer to the real value. Mathematical Formula of Compound Interest : If, P= Principal A= Amount (Principal + Compound interest) r= Rate of interest n= Number of year, capital remain invested it is given by Now, we ta...

  Friends, today I tell you about a interesting day name " Mole Day ". Interesting, because the timing and date represents a entire scientific number. OK, let's start.  Mole day is celebrated on October 23, between 6:02AM and 6:02PM. It is a day, generally celebrated among scientific community especially, Chemist, Chemistry students and chemistry enthusiasts. Friends, first I tell you what is mole? and then I describe why this date is chosen for Mole day .  What is Mole ? In Science, mole is a unit of substance like Dozen ( a set of twelve). e.g. I can say, "A dozen pens." , "One mole pens."  A dozen = 12 pieces 1 mole = 6.02214076 ✕ 10 23 pieces  The number 6.02214076 ✕ 10 23 is known as Avogadro's number .  In fact, we don't say one mole pens because one mole pen is huge number ( but we can say one mole pens). The unit "mole" is used in Chemistry. Generally, in Chemistry , we frequently use the terms: "1 mole H (Hydro...

  Friends, there are many words (or, terms) which mean differently in scientific world (or, scientific text) and in our daily life conversation. In this post, I try to write some common words which are used very often. In this post, I shall give two meanings of the particular words and explain the scientific terms wherever is required. So, let's start.... (1) Couple : In Science: The term or word " Couple " is used mainly in Chapter of Mechanics in Physics. "Couple" represents a pair of parallel, equal and opposite forces which are not in one line. In General : In general, everybody knows what the word "couple" mean. Generally, couple means two people who are married.  (2) Culture :   In Science :  The word " Culture " is mainly used in Biology, Microbiology, and Medical Science. Culture means the growth of micro-organism, tissue cells etc. in a specially prepared medium in laboratory.  In General : We all know the meaning of the work ...

  Nowadays, we all use soap for washing, bathing. There are many soaps of various brands available in the market. Some of them claim that they are Herbal, Natural. Have you seen ever the ingredients of the soap, you used daily at bathing, handwashing. Here, we try to aggregate the ingredients of the soaps of various brands commonly used in India. So that, you can compare them easily. In this post we provide the ingredient details of Lifebuoy (Silver Defence +) Lifebuoy (Lemon Fresh) Dettol (Original) Cinthol (Lime Refreshing deo soap) Cinthol Health Soap (Intense Deo Fragrance) Lux (International) Dove  Fiama (gel bar) Himalaya Neem & Turmeric Soap Mysore Sandal Gold Name of ingredients used int he soaps are collected from the packet of that particular soap. We provide the original image of the cover of the soap and image of the site of the cover where the name of ingredients are written. Lifebuoy (Silver Defence +) Ingredients: Sodium Palmate, Sodium Palm Kerne...