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The luminosity of the stars increases logarithmically up the vertical axis of the graph. Increase in temperature is plotted in increasing order from left to right on the horizontal axis. Three broad time periods or epochs are used to explain the geologic history of the planet Mars. The oldest one being the Noachin, followed by Hesperian and Amazonian. The Hesperian Epochis known to extend from about 3. The tightly packed DNA form which has limited transcription ability is known as heterochromatin.

The massive scalar elementary particle predicted and studied by the Standard Model in particle physics is known as the Higgs Boson. The sediments found on lunar highland surface, that are composed of broken rocks and mineral fragments is known as the highland soil. HTML is a programming language that is used for designing static web pages. The collection of structuring and formatting tags that are used to create Web pages. The phenomenon that galaxies tend to move away from each other and the farther away they are, the faster they are separated is known as Hubble Law.

The velocities of these galaxies increases proportionally to their distance. This phenomenon was discovered by US astronomer Edwin T. The space telescope that was carried into orbit by space shuttle is called Hubble Space Telescope. It was taken into orbit in April Hubble telescope is used to observe the Universe in wavelength ranging from ultraviolet to infrared. The mark-up language that leads to non-linear transfers of data is known as hypertext.

World Wide Web is the most commonly used form of hypertext. A tentative explanation based on facts, observation and incomplete evidence to explain a concept that is yet not verified is known as hypothesis. The growth of a primary cell that grows indefinitely in a culture due to transfer of a gene that is known as immortalizing oncogene. The variable among two related variables that can roam freely is known as independent variable. The other variable that is dependent on the former, is known as dependent variable.

The substance that exhibits one color in acids and another color when added to an alkali is known as indicator. When an object having magnetic or electrical properties produces similar properties in another object near it is known as induction.

A bodies tendency to remain at rest or stay in motion unless it is acted upon by an external force is known as inertia.

The light that has wavelength longer than that of visible light is called infrared. This light is measured from the nominal edge of visible red light at 0. This light is invisible to the human eye. It can be sensed as 'heat' or thermal radiation'.

Read more on Infrared Light Theraphy. It is the intensity of a radiation that is emitted during a radioactive decay. Know more on Meaning of radioactive Decay. The super network that connects smaller networks and allows different computers to exchange information is called Internet. There are a common set of rules known as protocols that are to be followed by all computers for communication. It is present between the duodenum and the ileum. The fibrous structural proteins that are tough and insoluble found in reptiles, birds, amphibians and mammals is known as keratin.

The fundamental unit of temperature that is not calibrated in terms of boiling point and freezing point of water but energy. The freezing point of water on the Kelvin scale is K and boiling point of water is K. The spherical region of the outer solar system that has a population of 'ice dwarfs' is known as the Kuiper Belt.

Know more on Facts About Dwarf Planets. A body maintains its kinetic energy gained, till there is change is speed. Read more on Read more on Electrokinetics.

The virus particle that infects Eisherichia coli , is known as lambda phage. A lambda phage has a head, tail and tail fibers. The head of a lambda phage contains double-stranded DNA that is injected into the host bacteria for further replication to produce more phages. The white blood cells of the immune system, that defend the body against infectious diseases and foreign materials are known as leukocytes. The electromagnetic radiation that can be detected by the human eye is known as light. The powerful flash of electricity that is due to the negative electrical charges in clouds or between the cloud and ground is known as lightning.

Know more on Different Types of Lightning. The radiation amount that is emitted by a star or celestial object at a given time is known as luminosity. Know more on Why Do Stars Twinkle. If the fluid is moving at a supersonic speed, the Mach number is greater than 1.

In case the fluid is moving at hypersonic speed is greater than 5. The force exerted by electric current on other electric currents is known as magnetism. Know more on History of Magnetism. The substances through which the movement of light takes place like air, water, glass, etc.

The branch of science that studies the quantity, structure, space and change is known as mathematics. It includes use of abstraction and logical reasoning. Know more on Meteor Shower. Know more on Parts of an Atom.

Our galaxy is observed as a misty band of light stretching across a night sky due to which it is known as milky way. There are one hundred million stars in our milky way. Modem is made by joining two words, 'Mo' dulation and 'De' modulation. Know more on What is the Function of a Modem. In other words, it is the speed or force of a moving object. The process through which the genetic information of an organism is changed naturally or experimentally by using chemicals or radiation is known as mutagenisis.

The speed of memory chips and other computer operations are measured in nanoseconds ns. The cloud of dust and gas in space is known as nebula. Know more on Horsehead Nebula. The bundle of peripheral axons that provides a pathway for the passage of electrochemical nerve impulses transmitted along each of the axons is known as nerves. Know more on Structure and Function of Nervous System. The purines, that is, adenine and guanine and the pyrimidines, that is, thymine, cytosine and uracil, that make up a DNA and RNA molecules are known as nitrogenous bases.

There are many species of plants that flower during the night instead of day. These are known as nocturnal plants. Know more on Facts About Nocturnal Animals. This is where the RNA is hybridized to a radioactive probe. This procedure is also known as Northern Hybridization. A sudden increase in the brightness of a star by a factor of more than hundred is known as nova. Know more on Supernova. It is a subfield of quantum physics. Know more on DNA Transcription.

A cell structure that helps carry out the important functions in the life of a cell is known as an organelle. Know more on Structure and Functions of Cytoplasm. A very small piece of an indivisible object is known as particle. The time interval occurring between two consecutive and similar phases of a regularly occurring event is known as period.

The rotation of Earth is the time taken to complete one revolution is an example of period. The external devices like printers, disk drives, display monitors, keyboards, mouse, etc. The branch of science under geology that studies the origin, occurrence, formation, structure and composition of mineral assemblages and classification of rocks is known as petrology. The anxiety disorder exhibited by a person that is related to extreme and irrational fear of simple things or social situations is known as phobias.

A phosphate group joined with the adjacent carbons through easter linkages is known as phosphodiester bond. The branch of science that studies matter and energy and its motion and interactions and all that is derived from it like force is known as physics. It is the constant which decides the size of the photon, which is a quantum of electromagnetic radiation.

This constant also decides the limits of accuracy with which any two complementary quantities can be measured. Planck's Constant is equal to 6. Planck's law exactly describes the amount of electromagnetic energy with a particular wavelength radiated by a black body in thermal equilibrium. The large, spherical body made of rocks and ice orbiting the Sun or another star is known as planet.

The extremely hot matter found in or near stars that contains more or less equal number of positively charged ions and negatively charged electrons is known as plasma. The hot, feather-like rising gas in the atmosphere of a star or planet that is due to convection is known as plumes. The structure located on the brain stem, above the medulla, below the mid brain and anterior to the cerebellum in humans and other bipeds, is known as pon.

Know more on Facts on Human Brain. The amount of power transmitted electrically is the product of voltage V with current I. Psychology is the only science without a specific definition. A rotating star or a pair of stars that emit electromagnetic radiation characterized by rapid frequency and regularity is known as pulsar. Quantum theory is extended to all particles. Know more on Basics of Quantum Mechanics for Dummies. Up, down, strange, charm, top and bottom are six types of quarks.

This is scientific observation that is not based measurements and numbers. Know more on Methods of Qualitative Research. Radiation is also the release of energy from a source. The spontaneous decay of atomic nuclei is known as radioactivity.

During radioactivity, alpha particles, beta-rays and gamma rays are emitted. Know more on List of Radioactive Elements. An old star that uses up all the hydrogen present in its nucleus to keep shining is known as Red Giant.

The star uses hydrogen instead of other elements present. The bending or deflection of a wave path of light or sound when passing through one medium to another, is known as refraction. The relative values of time, motion, mass and energy of a body in motion is known as relativity. Know more on What is Einsteins Theory of Relativity. The motion of a planet or the Solar System body in a clockwise direction is known as retrograde.

The rotation of a planet around the Sun through degrees or a full circle is known as revolution. Know more on How was the Sun formed. The antigen that is commonly referred as Rh factor, Rh positive and Rh negative is Rh D antigen only. It is named after the Rhesus Macaque, after discovery of the factor by Karl Landsteiner and Alexander Wiener using red blood cells from rhesus monkey. Know more on Rare Blood Types.

The act of a mass of body moving in a circle around its axis or fixed point is known as rotation. For example, the Moon is a satellite of Earth. A quantity that can defined only by its magnitude like energy, temperature is known as scalar.

The maria on the Moon's nearside known as Mare Serenitatis. Know more on Facts about the Moon. The sudden violent explosion on the surface of the Sun above the complex active regions of photosphere is known as solar flare. The procedure in which DNA restriction fragments are transferred from agarose gel to a nitrocellulose filter, where the denatured DNA is hybridized to a radioactive probe.

This process is also known as Southern Hybridization. The electricity that is produced by friction is known as static electricity. The sexual reproduction by the union of gametes or fertilization is known as syngamy. Know more on Different Stages in the Process of Meiosis. When crossing over occurs during the pairing of homologous chromosome pairs during prophase of the first meiotic division is known as synapsis.

The sequence of adenine-thymine rich promoter located bp upstream of a gene that is the binding site of RNA polymerase is known as TATA box. These codons also known as 'stop codon' are a signal to the end of protein synthesis. The rate at which there is change in temperature with position is known as thermal gradient. Know more on Thermocouple. It is the second largest moon of the Solar System after Ganymede, the moon of Jupiter.

The bodies tendency to rotate under an applied force is known as Torque. A tumor can be malignant or benign. One should not confuse cancer with tumor as cancer means malignant.

The device with a rotor that is turned by the force of a moving fluid like water, gas or wind that converts kinetic energy into mechanical energy is known as turbine. The thin membrane separating the inner ear from the middle ear is known as tympanic membrane or eardrum. The type of galaxy that appears too bright when observed at infrared wavelengths is known as ultra luminous galaxies. The region of the electromagnetic spectrum ranging from 9. UV rays are emitted from the Sun which are blocked by the Earth's atmosphere.

This everything includes energy, matter, stars, the planets, galaxies, and the contents of intergalactic space. It has a major influence on quantum theory. A back-up power unit that can provide continuous power when the normal power supply is interrupted is called UPS. It is abbreviation for Uninterruptible Power Supply. The rate of change of position is called velocity.

This is a physical quantity that needs speed and direction to define it. Read more on How to Increase Throwing Velocity. A virus in the world of computers is a computer program can infect a computer without the users knowledge or permission and copy itself, just like the biological agent. The organic compound that is required as a nutrient by an organism and is often obtained from its diet is known as vitamins.

The deficiency of vitamins can cause many diseases and illness in the organism. The plant pathogen consisting of nucleotides of a naked RNA molecule, whose extensive base pairing results in a nearly correct double helix is called viroid. The ability of an organism to complete its life cycle and survive till maturity is known as viability.

It is the network that allows real time conversation by sending digital voice information in packet form over the Internet. It does not use the traditional circuit committed protocol that is used by public telephone networks. It is equal to 1 joule per second. The distance between two peaks of a wave is known as wavelength. Know more on Electromagnetic Waves- Origin and Theory. The process to detect specific proteins in a sample of tissue extract by gel electrophoresis is known as Western Blot.

The light that can be seen by the human eye that is made up of seven colors is known as white light. Know more on Color Spectrum Chart. There is increase in energy of the object due to work. The XX chromosome is a pair of 23 homologous pairs of chromosomes in a female. Know more on Facts About Human Chromosomes. Retrieved September 14th, , from http: By continuing, you agree to our Terms of Use and Privacy Policy. Please set a username for yourself.

People will see it as Author Name with your public flash cards. A chemist at work in her chemistry laboratory. The definition of chemistry is a branch of science that deals with the form and properties of matter and substances or the interaction between individuals. YourDictionary definition and usage example. Link to this page. The composition, structure, properties, and reactions of a substance. The elements of a complex entity and their dynamic interrelation: The chemistry was good between the partners.

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This glossary of chemistry terms is a list of terms and definitions relevant to chemistry, including chemical laws, diagrams and formulae, laboratory tools, glassware, and equipment. Chemistry is a physical science concerned with . Chemistry definition is - a science that deals with the composition, structure, and properties of substances and with the transformations that they undergo. How to use chemistry in a sentence. a science that deals with the composition, structure, and properties of substances and with the transformations that they undergo.