Sixty-one years ago last November‚ John Bardeen and Walter Brattain discovered the transistor at Bell Labs‚ in 1951. Before this‚ electronics used tubes‚ which happened to be extremely bulky‚ generated lots of heat‚ and had short life spans. The invention of smaller‚ more efficient‚ and more durable transistors brought a revolution in electronics. They became an important discovery that changed the world forever. The first ideas and experimentation with solid-state electronics began in 1874‚ but
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“Is Density An Intensive Property Of Matter?” By: Mikal Hayden - Gates A. Introduction The first unit we learned in chemistry was Alchemy. In this unit I learned about the extensive and intensive properties of matter. An extensive property is a property of matter that depends on the changes of the substances shape or amount. An intensive property is a property of matter that doesn’t depend on the substances shape or amount. The purpose of this investigation was to prove that density is
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into the address bar. 2. When the simulation page opens click “Run Now!” 3. Click the “Buoyancy Playground” tab at the top of the window. 4. Look in the yellow data box in the top left corner of the window. Record the mass (m)‚ volume (V)‚ and density (ρ) of the wood block. 5. In the middle of the screen there is a container of water. Record the volume of the water. 6. Drop the wood block into the water. Does the wood block float? Explain why or why not. 7. Place the block so that
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and Time Matter and Model-Building Density and Atomic Mass Dimensional Analysis Conversion of Units Estimates and Order-ofMagnitude Calculations Significant Figures ANSWERS TO QUESTIONS Q1.1 Q1.2 Atomic clocks are based on electromagnetic waves which atoms emit. Also‚ pulsars are highly regular astronomical clocks. Density varies with temperature and pressure. It would be necessary to measure both mass and volume very accurately in order to use the density of water as a standard. People have
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Size of hydrocarbon molecules inc‚ f.o.a inc‚ more heat overcome f.o.a * Density Mass per molecule inc faster than volume per molecule * Gas – liquidSize of hydrocarbon molecule inc‚ f.o.a stronger‚ mp&bp inc * Insoluble in water‚ soluble in organic solvent(covalent comp) * Insulator * Less dense than water | * MP & BP Size of hydrocarbon molecules inc‚ f.o.a inc‚ more heat overcome f.o.a * Density mass per molecule inc faster than volume per molecule * Gas – liquidSize of
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between solid and fluid Calculate common fluid properties: i. Mass density ii. Specific weight iii. Relative density iv. Dynamic viscosity v. Kinematic viscosity INTRODUCTION Fluid Mechanics Gas Liquids Statics i F 0 F 0 i Laminar/ Turbulent Dynamics ‚ Flows Compressible/ Incompressible Air‚ He‚ Ar‚ N2‚ etc. Water‚ Oils‚ Alcohols‚ etc. Stability Pressure Buoyancy Surface Tension Compressibility Density Viscosity Vapor Pressure Steady/Unsteady Viscous/Inviscid
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Title: Laboratory Techniques and Measurements Purpose: To properly use‚ understand‚ and correctly convert the scientific measurements such as: finding density‚ converting centimeters to millimeters‚ 3 different units of temperature‚ etc… Procedure: I used a metric ruler to measure the length of the objects‚ a thermometer to determine the degrees of the water‚ and a scale to determine the mass of the designated objects. I used the proper equipment to measure out or hold the item. After I gathered
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floating and then classify objects according to whether they sink or float. CONTEXT In this activity students will determine whether various objects sink or float in water. Whether an object sinks or float in a liquid depends mainly on two factors: density and buoyancy. However‚ at this level‚ students do not need to explain why objects sink or float. They are rather to be encouraged to observe that the same objects will sink or float every time‚ i.e.‚ that there is consistency in the way the objects
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The floating egg experiment – How much salt is needed to make an egg float? Aim: To investigate the effects of salt on the density of water (and therefore the ability to float an object in said water) and to find the amount of salt needed to float one regular egg in a glass of water. Research: Internet research shows that adding salt to water increases the density‚ and in turn makes it easier for objects to float. 4-10 teaspoons of salt in 1 glass of water is said to be enough to make one egg
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the cell will wither and dry out—and eventually die. More generally‚ the property of water that allows it to expand when frozen only goes on to show how dependent life is on the existence of water on Earth. Because the density of frozen water‚ or ice‚ is lower than the density of liquid water‚ a layer of ice forms over the water still in its liquid state; this layer of ice insulates the water underneath it‚ ensuring that the water will remain‚ for the most part‚ in liquid form. If ice was denser
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