छड़ी कहानी के लेखकchhadi Kahani ke lekhak kaun hai ​

Amedeo Avogadro (1776 - 1856)-is best known for his hypothesis that equal volumes of different gases contain an equal number of molecules, provided they are at the same temperature and pressure.

Jons Jacob Berzelius (1779 - 1848)-is credited with discovering the chemical elements cerium and selenium and with being the first to isolate silicon and thorium. Berzelius discovered cerium in 1803 and selenium in 1817.

Robert Boyle (1627 - 1691)- He is best known for Boyle's law, which describes the inversely proportional relationship between the absolute pressure and volume of a gas, if the temperature is kept constant within a closed system. Among his works, The Sceptical Chymist is seen as a cornerstone book in the field of chemistry.

Marie Curie (1867-1934)- Marie Sklodowska Curie (1867–1934) was the first person ever to receive two Nobel Prizes: the first in 1903 in physics, shared with Pierre Curie (her husband) and Henri Becquerel for the discovery of the phenomenon of radioactivity

John Dalton (1766 - 1844)-

Dalton was a very important chemist that came up with a law about partial pressures. He developed a table of atomic weights for atoms and proposed his atomic theory. John Dalton's Atomic Theory stated that all matter composed of variety small particle atoms, which provides unique characteristics and weight.

Answer:

Name of Scientists who contributed in chemistry: Dmitri Mendeleev, Marie curie, Robert Boyle, Prafulla Chandra Ray, Linus Pauling, Ernest Rutherford, etc.

Explanation:

• He was the Russian chemist.
• He is known for contributing in forming of periodic law and using in putting elements in periodic table.
• He put periodic table's elements in the groups based on their chemical and physical properties.
• Due to this, he could predict the elements and their properties which were yet to be discovered.
• He predicted three elements which were yet to discovered, i.e., Eka-Aluminum (discovered element-Gallium), Eka-boron (discovered element-Scandium) and Eka-silicon (discovered element-Germanium).

• Marie curie discovered metallic elements Radium and Polonium.
• She Isolated pure state of metallic Radium for the first time.
• She carried out the first research on cancer tumors with radiation therapy.
• She won Nobel prize for her contribution in chemistry as well as physics.
• She is the only person who won Nobel prize in both physics and chemistry.

• Boyle is known as a founder of Modern chemistry
• Robert Boyle Discovered the Boyle's law of gas which is as below:

"At constant temperature, the absolute pressure is inversely proportional to the volume of a fixed amount of gas."

• He also developed the methods to determine purity of compounds and chemicals.

• 'Antoine Lavoisier' is known as 'Father of Chemistry'.
• He discovered that mass is conserved in a chemical reaction.
• He proved the law of conversion of mass.
• He gave the oxygen theory of combustion.

• Prafulla Chandra Roy was Bengali-Indian chemist.

• He is known as Father of Chemistry of India.
• He discovered Mercurous nitrite chemical compound.
• He was the founder of India's first pharmaceutical company: 'Bengal Chemicals and Pharmaceuticals'.

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she went to boston to meet someone and get ideas for the novel

Answer:

Wildlife conservation means the act of protecting the wildlife. On this earth, the wildlife is equally important like human beings. But unfortunately, the wildlife on this earth is always in danger as we, the human being are destroying it regularly only to fulfill our personal needs. Many animals are on the verge of extinction due to the irresponsibility of man. Trees are vanishing from the earth daily. As a result of that, the ecosystem and the balance of nature is deteriorating. In India, the growth of population has caused a lot of damage to the wildlife. Though we have wildlife conservation laws in the country it has not reduced the destruction of wildlife as expected. People need to feel the importance of wildlife and try to protect it from being destroyed.

Essay on Wildlife

Protection of wildlife:

• Plant and animal species are protected through wildlife conservation.
• Wildlife is a component of the world's ecosystems.
• It contributes to the balance and stability of natural processes.
• Wildlife conservation aims to ensure the survival of these species while also educating people on how to live in harmony with other species.
• The world's billions of people are depleting natural resources at an unprecedented rate.
• The habitats and existence of numerous forms of wildlife around the world are also threatened by this growth and development, especially animals and plants that may be relocated for land development or consumed for food or other humanitarian reasons.
• National and international organisations are working to assist global animal and habitat conservation efforts.
• They collaborate with the government to create and safeguard public lands such as national parks and wildlife refuges.
• They also encourage biodiversity to meet the needs of an expanding human population while also protecting current species and habitats.

Answer:

गाँवों में बहुत कम दुकानें होती हैं, जबकि शहर में बड़ी मात्रा में दुकानें और मॉल होते हैं। गाँव में गाड़ियाँ बहुत कम होती हैं, वहीँ शहरों में सड़कें गाड़ियों से भरी रहती है। शहर में लगभग हर घर में एक गाड़ी होती है। ... गाँव में एक या दो स्कूल होती है और वे भी सरकारी होती हैं, जबकि शहर में बहुत सी प्राइवेट स्कूल होती हैं।

गाँव और शहरों में बहुत अंतर हैं

दोनों अपनी-अपनी जगह पर अच्छे हैं।

उदाहरण के लिए गांवों में हमें ताजी हवा मिलती है। कोई प्रदूषण नहीं। लेकिन परिवहन व्यवस्था और बिजली की भी समस्या है।

जहां शहरों में बिजली और परिवहन की समुचित व्यवस्था है लेकिन शहरों में ताजी हवा नहीं होती, सिर्फ प्रदूषण होता है