Chemistry Podcast

Showing posts with label Science TALK. Show all posts
Showing posts with label Science TALK. Show all posts

Sunday, 13 February 2022

How to Measure Temperature With a Mercury Thermometer

 How To Measure Temperature With A Mercury Thermometer

How to Measure Temperature With a Thermometer

Temperature is one of the important property which tells us so much information about substance or body. With the help of temperature you can predict in which state the material is, is it cool or hot, is it good too touch or not, thermodynamics, and even about humans you can get information like someone is well or suffering from fever etc.

Too measure temperature place tip of thermometer in substance (liquids like water, oil) whose temperature to be measured. Wait for some time. Mercury rises upside and stop rising after some time. This reading at which mercury stop rising is your temperature reading.

You can measure temperature at any scale or convert in any scale like degree Celsius, degree Fahrenheit, Kelvin etc.

Human body temperature can be measured with analog (mercury) or digital thermometer. To measure temperature of human body place thermometer under tongue or armpit. Hold the thermometer their for about 40-50 seconds then see reading on thermometer. In digital thermometer their is generally a beep sound, indicating measurement complete. So you can remove thermometer and see temperature reading on display of digital thermometer.

Video on How To Measure Temperature With A Thermometer

Friday, 4 February 2022

What is Viscosity in Chemistry

What is Viscosity in The Field of Chemistry

What is Viscosity
Do you know! “What is viscosity in chemistry“. To understand about viscosity, we take example of some liquids like Honey and Water. As we know honey is thicker than water. So honey flow with very slow speed on floor than water, as water is very less thick so it flows quickly. 
Hence we can say that liquids with high thickness (like honey) flow slowly and have high viscosity while a liquid with low thickness (like water) flows quickly and have low viscosity.

Example of Viscosity

To understand viscosity very well, just take few examples of viscosity in daily life.
  • Cooking Oil
  • Honey
  • Lubricant
  • Engine Oil
  • Brake Oil
  • Liquid Soap
These highly viscous liquids are some examples of viscosity in science. You known viscosity very well, even before listening this term viscosity in your physics & chemistry class.

Definition of Viscosity

Viscosity can be defined as the fluids resistance to flow.

What is Viscosity

In chemistry, Viscosity of a fluid is the measure of its resistance to gradual deformation by the tensile stress or shear stress. We can also say that viscosity is the internal resistance of the fluid. Fluids which have high viscosity resists to move as its molecular makeup gives this fluid a too much internal friction to motion, while fluids which have low viscosity resists less to move as its molecular makeup gives this fluid a less internal friction to motion.
So, we can say that molecular makeup decides internal friction between them and which ultimately provides viscosity of fluid. Honey has high internal friction than water so honey have high viscosity than water.

What is Meaning of Viscous

To understand viscosity. First, we learn what is the meaning of word “Viscous”. So, viscous is property of material i.e. material having a thick, sticky consistency between solid and liquid and also having a high viscosity. 

Who Poses Viscosity

Along with liquids or fluids, gases also have viscosity but it is very difficult to notice viscosity of gases at ordinary conditions.
We learn this chemistry topic under chemistry terminology category and Physical Chemistry Notes by Chemistry Notes Info in simple way, we can say that, “Viscosity is the resistance of a fluid to change in its shape”,  viscosity is resistance to flow. Fluidity is the reciprocal of viscosity, So now we can say that honey has high viscosity and low fluidity while water has low viscosity and high fluidity.
Viscosity play very important role in determining characteristics of fluids used in lubrication and transportation, spraying, surface coating, injection molding etc.

Formula of Viscosity

Viscosity of any liquid can be calculated with viscosity formula. And viscosity formula is given below to calculate viscosity of any fluid or liquid.
Viscosity = Force×Time ∕Area

Newton’s Viscosity Law

According to the Newton’s viscosity law’, Shear stress between the two adjacent fluid layers is directly proportional to the velocity gradients between these two layers.

Unit of Viscosity

Unit of Viscosity is Newton second per Square meter (Ns/m2)
SI unit of viscosity is Pascal second (Pas)

Relation of viscosity with temperature

Viscosity of the liquids decreases quickly with increase in the temperature, while viscosity of the gases increases with increase in the temperature.
Temperature ->27 °C77 °C
Viscosity of Water0.85×10-3 pascal second0.36×10-3 pascal second
Viscosity of Air1.85×10-5 pascal second2.08×10-5 pascal second

Types of Viscosity

Viscosity is classified in two types. which are as follows-

1. Dynamic Viscosity

Dynamic viscosity is defined as the measure of the ratio of 'shear stress to shear rate' of the fluid.

Formula of Dynamic Viscosity
Dynamic Viscosity - Types of viscosity in science chemistry physics

2. Kinematic Viscosity
Kinematic viscosity is defined as the measure of ratio of 'viscous force to inertial force' on the fluid.

Formula of Kinematic Viscosity

Measurement of viscosity
Viscosity is measured by various types of Rheometers or Viscometers.

Wednesday, 2 February 2022

Forensic Science Chemistry - Famous Forensic Scientists and Forensic Chemist

Forensic Science Chemistry - Famous Forensic Scientists and Forensic Chemist

In this post we will learn about forensic science and forensic drug chemistry. Also learn about fathers of various fields of forensic science and famous forensic scientists and forensic chemist.

In this post we will learn about forensic science and forensic drug chemistry. Also learn about fathers of various fields of forensic science and famous forensic scientists and forensic chemist.

Definition of Forensic Science

Forensic science is the application of scientific methods and techniques to matters under investigation by a court of law. Almost all branches of science may contributes to solve a crime scene, hence comes under forensic science.

Forensic Drug Chemistry

Forensic drug chemistry is the sub-branch of chemistry.  Forensic drug chemistry is used in identification of matter generally illegal drugs. The Forensic chemist examines the samples bring in forensic chemistry lab. Forensic chemist tries to find the name of matter or drug by examining the atoms and molecules in matter. Also find how these atoms and molecules interact and bond with each other. As we know, all matter or drug substance has a chemical signature (Spectrum, that you study under spectroscopy) and or some physical and chemical properties which are unique to only that substance. Forensic chemists use these physical and chemical properties to identify matter or drug substances using scientific techniques or methods. Findings by examining samples are presented as facts in court. Forensic chemistry covers analysis of any matter like illegal drugs, explosives, poisons etc.


What does Forensic Scientists and Forensic Chemist do ?

Forensic Scientists examine and analyze evidence or matter obtain from crime scenes. Forensic chemists conduct analysis of matter forensic chemistry. While other forensic scientists do other analysis like fingerprinting, handwriting analysis, DNA, trace evidence examination, fire and explosives examinations, forensic toxicology, digital evidence and many other analysis.  After doing all analysis they develop objective findings that can assist in the investigation and prosecution of person who has done crime or release the innocent person.

List of World Famous Forensic Scientists and Forensic Chemist 

Given below is the list of world famous forensic scientists & forensic chemists. These forensic chemists or forensic experts made great contribution to solve mysterious crime scenes and help in providing justice.

Dr. William Bass (United States)
Dr. Joseph Bell (Scotland)
Dr. Edmond Locard (France)
Pakkiriswamy Chandra Sekharan (India)
Dr. Henry Faulds (United Kingdom)
William R. Maples (United States)
Henry Chang-Yu Lee (China)
Frances Glessner Lee (United States)
Robert P. Spalding (United States)

List of Famous Indian Forensic Scientists and Forensic Chemist 

Given below is the list of popular forensic chemist and forensic scientists in India. These are very popular scientists in India, who made great contribution to solve mysterious crime scenes & help in providing justice.
Pakkiriswamy Chandra Sekharan
Anil Aggrawal
Tirath Das Dogra
Bhooshana Rao
Chandre Gowda
J. M. Vyas
Yusuf Matcheswalla
K. S. Narayan Reddy
Kewal Krishan

List of Fathers of Various Fields of Forensic Science

Given below is the list of fathers of various fields of forensic science.

Fields of Forensic Science

Name of Scientists or Father of

Father of Forensic Science

Bernard Spilsbury

Father of Fingerprints

Francis Galton

Father of Toxicology


Modern Father of Toxicology

Mathieu Orfila

Father of Forensic Odontology

Oscar Amoedo

Father of Criminal Identification System

Alphonse Bertillon

Father of DNA Fingerprinting

Alec John Jeffreys

Father of Criminology

Cesare Lombroso

Father of Forensic Medicine

Paolo Zacchia

Father of Forensic photography

Alphonse Bertillon

Father of Forensic Psychology

Hugo Munsterberg

Father of Criminalistics

Hans Gross

Father of Firearm and tool mark examination

Calvin H. Goddard

Father of Explosives

Alfred Nobel

Father of Bloodstain Pattern Analysis

Dr. Eduard Piotrowski

Father of Computer Forensics

Michael Anderson

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Thursday, 27 January 2022

20 General Science Quiz Questions and Answers

20 General Science Quiz Questions and Answers

#GeneralScienceQuiz #sciencequiz #ChemistryNotesInfo #GeneralScienceGk #ScienceGk #GeneralKnowledge This Science Quiz video contains 20 General Science Quiz Questions and Answers. You have 10 seconds to answer any question. After 10 seconds answer is highlighted with green square.
This quiz increases your general knowledge of science. View video or solve quiz below-

MCQ-1.  Which of the following is a non metal that remains liquid at room temperature? :


MCQ-2.  Which of the following is used in pencils ? :


MCQ-3.  Name an antiviral medicine used for a clinical trials by the Gilead Sciences for Corona Virus (COVID-19) treatment? :


MCQ-4.  Which of the following statement is correct about the antiviral ? :

  Antiviral drugs are used to kill or stop growth of virus
  Antiviral drugs are used to stop the replication of the virus or infecting cells
  Examples of antiviral include HIV drugs, Oseltamivir (Tamiflu), Penciclovir, Peramivir etc.
  All of the above

MCQ-5.  Who coined the term the “Super Moon” ? :

  Albert Einstein
  Richard Nolle
  Michel Gauquelin

MCQ-6.  In how many number of days Moon orbits the Earth ? :


MCQ-7.  Double stranded Deoxy ribonucleic acid (DNA) is found in which viruses ? :

  Influenza viruses
  None of the Above

MCQ-8.  Which is the most common type of the cancer that kills men in the world ? :

  Prostate Cancer
  Lung Cancer
  Liver Cancer
  Brain Cancer

MCQ-9.  Cancer which is also known as The Silent Killer ? :

  Lung Cancer
  Liver Cancer
  Brain Cancer
  Stomach Cancer

MCQ-10.  Which NASA mission brought first human to Moon ? :

  Apollo program
  Mercury Program
  Gemini Program
  NASA Space Program

MCQ-11.  Release of the ovum from ovary is called ? :


MCQ-12.  The shortest distance between crest to crest is known as ? :


MCQ-13.  Which are the good sources of Iodine ? :

  Fresh vegetables & Fruits
  Sea Foods

MCQ-14.  Strongest part of magnet is ? :

  North pole
  South pole
  North & South Pole
  Median of North & South Pole

MCQ-15.  Which unit is used to measure magnetic flux :

  Science Quiz

MCQ-16.  Transport of water in plants conduct by ? :


MCQ-17.  Deoxyribonucleic Acid (DNA) structure was first described by which scientist ? :

  Charles Darwin
  Stephen Hawking
  Michael Faraday
  Watson & Crick

MCQ-18.  Smallest bones in human body are found in ? :


MCQ-19.  A candle transforms the ? :

  Mechanical energy into light & heat energy
  Chemical energy into light & heat energy
  Sound energy into heat & light
  Mechanical energy into electrical energy

MCQ-20.  In plants during process of photosynthesis, released oxygen comes from the :


Friday, 21 January 2022

Science Quiz on Famous Scientists and Their Inventions & Discoveries

Science Quiz on Famous Scientists and Their Inventions & Discoveries
 Science Quiz on Famous Scientists and Their Inventions & Discoveries

Dear #ChemistryNotesInfo Lovers! 

    This science quiz contain multiple choice question answers in MCQ Quiz mode. This quiz contain questions on famous scientists and their inventions & discoveries. These are really great scientists who made this world great place to live with their discoveries & invention! 

Without wasting time solve quiz below- Good Luck!!!

MCQ-1.  Which of given below scientist shows that oxygen is very important for burning or combustion ? :

  Marry Curie

MCQ-2.  Who is the founder of nuclear chemistry ? :

  Albert Einstein
  Neils Bohr
  Jitendra Singh Sandhu
  Marie Curie

MCQ-3.  Who is the 1st women to win the NOBEL prize ? :

  Marie Curie
  Robert Kiyosaki

MCQ-4.  Which of these famous scientists discovered that germs causes diseases ? :

  Marie Curie
  Louis Pasteur
  Newton & Chemistry Notes Info

MCQ-5.  Which world famous scientist discovered the theory of relativity :

  John Nash
  Alexander Grahm Bell
  James Clerk Maxwell
  Albert Einstein

MCQ-6.  Which scientist discovered the theory of electromagnetic radiation ? :

  Albert Einstein
  Max Plank
  Jagmeet Singh Sandhu
  James Clerk Maxwell

MCQ-7.  which of the given below scintistt is the founder of genetics ? :

  Gregor Mendel
  Galileo Galilei
  Rene Descartes
  Blaise Pascal

MCQ-8.  Which famous scientist made possible the invention of adding machine ? :

  Thomas Bartholin
  Blaise Pascal
  William Oughtred
  Christiaan Huygens

MCQ-9.  Which famous scientist made possible the discovery of red blood cell ? :

  Galileo Galilei
  Otto von Guericke
  Pierre de Fermat
  Jan Swammerdam

MCQ-10.  Which Scientist is a pioneer of alternating current motors ? :

  Isaac Newton
  Thomas Edison
  Nikola Tesla
  Sandhu Jitendra

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