Science Pedia

  Green Chemistry and Nanotechnology Chemistry place an important role to improve the quality of our life unfortunately due to this achievement our health and global environment under threat . Also , due to increase in human population and the industrial revolution ,  energy crisis and environmental pollution are highlighted major global problems in the 21st century . To minimize the problem of energy crisis and pollution , we have to adapted green chemistry . Green chemistry is an approach to chemistry that aims to maximize efficiency and minimize hazardous effects on human health and environment . This concept was coined by the green chemistry by Paul T . Anastas . Definition of green chemistry is the use of chemistry for pollution prevention by environmental conscious design of chemical production and process is that reduce our any minute the use of generation of hazardous substance . Green Chemistry is to reduce the impact of energy crisis , pollution and to save n

  Wave optics First what is wave optics ? Ray optics means reflection or refraction of light and what is a light that mean we have to study what is a light ? Newton proposed a theory  :-  Corpuscular nature of light   Corpuscular means a particle of light  1)  Hard , elastic and massless .   2)  They travel with high speed in the vacuum and else . 3)  Different colours due to different shape and size . He explained that speed of light in denser medium is higher than in rarer medium . Vd  >  Vr    ( explained by Newton )  It was WRONG . It was drawback of Newton's corpuscular nature of light  . He couldn't explain polarization interference and diffraction . He explained  refraction and reflection of light . Theory by Huygens  (Wave Nature) He explained that wave is a mechanical wave . Different colours due to different wavelength . Could explain reflection , refraction , interference , and diffraction . Result obtained -  Velocity of light in denser medium is less than veloc

Respiration   All living organisms require energy to carry out various life processes .  The energy that is stored in the body in the form of complex organic compounds means (potential energy) is  however not usable  by the organisms unless it is converted into usable form . This conversion is achieved through the process of respiration . Respiration   It is a bio-chemical process all oxidation off origanic  compounds in an orderly Manner for the liberation of chemical energy in the form of ATP . C6 H12 O6  +  O2  ➡  6 CO2  +  6H2O +  38 ATP  For this, the process gaseous exchange takes place the organism and  the environment . The site of gaseous exchange is called the respiratory surface . Organs of Respiratory Exchange Respirator exchange is a simple physical process . For efficient gaseous exchange , the respiratory surface should have the following features :-  a.   It should have a large surface area . b.   It  should  be  thin, highly vascular  and permeable to allow exchange of

  How to keep eyes healthy  ?  As you know that our eyes are very important for our daily life as we see everything because of our eyes watching for the things surrounding us the things surrounding us .  In our modern life we are very working to have more screen time on our mobile or computer and our TV . So we must do care of our eyes for getting rid of the spectacles . Most and very important method is  eating Carrot  . Carrots helps our eyes for more blood circulation and having more healthy eyes . Our grandmother and mother says that we must drink copper water for our best caring of our eyes because the copper enhance our eyes for more great seeing sight . Method second is that we must  we must take Saffron with milk . We must reduce our screen time from Mobile , Computer and TV for reducing the stress on our eyes . The next way is that we have to see more green colour in our life for that because green colour is the colour which makes our eyes relaxed !! The best way f

How to stay Hydrated ? Hydration means keeping your body of full-filled water about our need for our body . Our body is 70 % made up of water and some other minerals . A human must drink at least 3 litres of water for survival . Dehydration  :-   It is opposite to the hydration that means the loss of water in our body making us dehydrated . Dehydration is very harmful to our body because our body is very need of water for survival . A man can live 3 weeks without food but a man can't live more than 3 days of water . In the hot summer climate or in deserts region there is a lot of loss of water from our body by sweating and little pee . We can lose 1 litre of water in desert region by sweating and we never else feel that !! If a human loses his 10 % of water of his body then he have higher chances to die . Drinking water about 4 litres is healthy for our body . And if we drink about more than our limit then we will suffer from diarrhea and we will get