# Scientific Definitions

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Scientific Definitions
Speed :The distance travelled by amoving body is called speed.
Pressure :Pressure is defined as thrust per unit area. Pressure Thrust/Area
Science:Knowledge arranged in the orderly manner is called scientific Knowledge or science.
Liquid: A liquid is an in compressible fluid. it lacks rigidity It presents afree surface when put on open Vessel.
properties of liquid: 1. Liquids have a definite vilume.2. Liquida no definite shape.3. The exert pressure on all sides.4.They transmit pressure equally in all directions.5. They keep their level.
Malleability :This is a property found in metals. By virtue of this property metals can beaten into speets.
Ductility: Ductility is the property by virtue of which metal can drawn into wires by passing them through a hole or a die.
Newtons's Laws of Motion:
First Law:Everbody in this universe continous in its state as rest of motion in a straight line unless. it is compelled by some external force to change that state.
Second Law:the rate of change of momentum is direct proportinal to the force acting on it and plac in the directing of the force.
Third Law:To every action there is equal and opposite reaction.
Lever:The lever is arigid bar which can tuurn freely about fixed point called Equillibriums.
Motion:A body is said to be in motion if it occupies different position at different times, with respect to the surounding objects.
Velocty:Speed in a define direction is Known as velocity.
Rest:A body is said to be in a rest if its position with respect to the surrounding objects remains unchanged at different instants of time.
Uniform Velocity:A body said to posses uniform velocity if it covers equal distance in equal intervals of time.
Equillibrium:A body said to be in aequillibrium state of equillibrium when the various froces acting on it do not change its state of rest or uniform motion inb a straight line.
Pascal's Law:Pressure applied to any part of a iquid contained in vessel is transmitted with undiminihed force in every directin and acts with the same force upon equal areas.
Pulley:Pulley is a disc having agroovo in its edge and is capable of turning freely on an axle through the centre.
Matter:Matter is something which occupies space and has somee weight.
Cohesion:The force of attraction which exists between the molecules of one and the same substance is called cohesion.
Distillation:It is the process of converting a liquid into vapours and then cooling the vapours again into liquid form.
Density:Density is defined the mass per unit voulme.
Humidity:The degree of dampness of the atmosphere is called Humidity.
Latent Heat:Latent heat is amount of heat required to change one gram of ice at 0 degree centigrade to one gram of water at 0c. It is equal to 80 calories of heat and is found by method of mixtures..
E.C.G :E.C.G is primarily a tool for evaluating the electrical events within the heart muscles.
Chemical Element:A chemical element is that part of matter which cannot be divided into simpler parts.
Variable Velocity:A body is said to have variablevelocity if it covers equals distances in unequal intervals of time or unequal distances in equal intervals of time.
Pole Star:A fixed Star North pole of the earth Points towards it.
Solar Cells:Razor thin strips of silicon which convert the energy of the sun's rays photo electrically into electrical energy.
Meteorities:Metor is solid body from the outer space small meteors burn up completely in the atmosphere, but some of the larger ones survive and falol to earth as meteorites.
Solar Eclipse or Lunar Eclipse :The passage of non-luminous body into shadow of another.An ECLIPSE OF THE MOON or Lunar Eclipse occurs, when the SUN, the EARTH and the MOON in line so that the shadow of earth falls upon Moon.
Solar System: System of 9 planets: Mercury,Venus,Earth,Mars,Jupiter,Saturan,Uranus,Neptune and Pluto and of the belt of ALTEROIDS revolving in elliptical orbits around the sun.The orbits are nearly circular.
Planets:There are Heavently boies revolving in the definite orbits about the sun they are Mercury,Venus,Eatrh, mars,jupiter,saturn, uranus,neptune,pluto .
Virus:A member of a group of microscopi agents that infact plants and unable to mltiply outside the host tissues.They also attack bacteria and mushrooms. A fully formed mature tirus consists of Nucleic acid within protein and pid coat.
Fermentation:It is a chemical change in which ecomposition is caused by enzzeme action, pasteur proved that fermentation was caused by yeast.
Enteric Fever:Typhoid fever which is caused by contaminated water, milked or insanitary conditions.
Diabetes:A disease of the pancreas which is caused by urine.
Myopia:Short sightedness a defects of vision that is caused by distortion of lense, defect is correctable by the use of concave lenses.
Disinfectant:A substance that is capable of destroying germs.
Allergy:Excessive sensitiveness to the action of some foods or other substances,normally harmless.
Photosynthis:In green plants,synthsis of organic compounds from water and carbondioxide,using energy absobed chlorophyll from sunlight is called photosynthis.
Retina:Nerve cells which recieve the sensation of light lie and the back of eye in retina apart of eye.
Radio Waves:Are sent from instrument.Invisible object reflects the waves.
Selsmograph:It is an instrument used for recording earth quake shocks.
Speedometer:It records the speed at which a vehicle moves.
Nuclear Fission:It is nuclear reaction in which heavy atomim nuclear ie uranium spilts in almost two equal parts.It emits neutrons and realeases a very large amount ofnuclear energy.
Energy:Capacity for doing work is called energy.Energy of various types electrical, chemical nuclear etc.
Willow:It is tree whose branches bend easily and are used take baskets and cricket bats.
Protoplasm:Living material within the cell is called protoplasm.
Chromosome:Bearer of genetic information from one generation to next.
Genetics:A science which deals with heridity.It deals with transmission of character from one generation to other.
Germ cells:Cells which particiapate in reproduction .
Hydrophone:An instrumrnt which isuse for recording sound under water.
Hydrometer:An instrument which is meant to measuring the specific gravity of liquids.
Electrometer:It is an instrument for measuring electricity.
Insulator:These are the substances which do not electricity to pass through them.
Conductors:These are the substances which allow electricity to pass through them.
Oxidation:A process of addition of oxigen.
Potential Energy:Energy possesed by the body by virtue of position or shape.
Nuclear Fuel:A substance which undergoes nuclear fission a nuclear reactor.
Outer space:It is that part of universe which lies beyond earth atmosphere.