usually cubic metres (m3)‚ e.g. 200 mg/m3 or using ppm without any reference‚ e.g. 140 ppm Please note Because of the variation of a gas volume with temperature and pressure changes it is necessary to use one of the following alternatives for describing a concentration value: additional specification of gas temperature and pressure values existing during measurement or conversion of the measured concentration value into the corresponding value at standard zero conditions‚ see the following chapter
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THERMAL PHYSICS LABORATORY: INVESTIGATION OF ADIABATIC PROCESSES IN AIR This experiment has two parts. In the first‚ you will use a dynamic method to measure the ratio of the specific heat capacities of air and‚ in the second‚ you will investigate the behaviour of gas undergoing an expansion that is approximately adiabatic and ‘partially reversible’ – somewhere between the two limits of a completely irreversible (free) and perfectly reversible expansion. The air can be considered an ideal gas
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Hoo Sze Yen Form 4 Experiments Physics SPM 2008 CHAPTER 1: INTRODUCTION TO PHYSICS 1.1 PENDULUM Hypothesis: The longer the length of a simple pendulum‚ the longer the period of oscillation. Aim of the experiment: To investigate how the period of a simple pendulum varies with its length. Variables: Manipulated: The length of the pendulum‚ l Responding: The period of the pendulum‚ T Constant: The mass of the pendulum bob‚ gravitational acceleration Apparatus/Materials: Pendulum bob‚ length
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mass‚ pressure (P)‚ thermodynamic temperature (T) and volume (V). These properties are related to each other and the state of a gas is determined by their values. The three laws are derived from these properties. Discussion Boyle’s gas law Boyle’s law relates the volume and pressure of an ideal gas. It states that when the temperature of a given mass of a confined gas is held constant‚ its pressure and volume are inversely proportional. In other words‚ the product of absolute pressure and volume
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slop of the pressure/volume(P/v) diagram‚ near the start‚ in the middle and at the end of the compression. 2. To determine the indicated work/cycle of the compressor from the P/v diagram. Where: Work/cycle=(m.e.p) x (piston-area) x stroke And m.e.p= mean effective pressure= average pressure(i.e stroke of the compressor) 3. To determine the volumetric efficiency of the compressor. A pressure transducer is used so that a potential drop will be created for a change in pressure. A similar
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determining the volume of a known amount of gas (H2) at a measured temperature and pressure. Determination of Whether Boyle’s Law Applies to Air Boyle’s Law states that for a fixed amount of gas at constant temperature‚ the pressure of the gas will vary inversely with the volume so that P ∝ 1/V or PV = a constant (if n and T are constant). To determine whether this relationship holds for a mixture of gases‚ the pressure of a fixed amount of air (which is a mixture of gases) will be measured as the
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financial pressures‚ vices‚ or because of work-related pressures. As well‚ perpetrators of fraud can be motivated by a perceived opportunity to commit fraud and the ability to rationalize that what they are doing is not wrong. Their motivations are usually combined into the fraud triangle of perceived pressure‚ perceived opportunity‚ and rationalization. 3. The fraud triangle includes three elements that almost always must be present in order for someone to commit fraud: a perceived pressure‚ a perceived
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Variable- Independent- Amount of Catalase (Filter Paper) Dependent- Amount of Oxygen (kPa) Constant- Temperature in Fahrenheit‚ 2 Pipette of Hydrogen Peroxide‚ 0.8 Cm Filter Paper Punches Materials: * 6 Test Tubes * Vernier Gas Pressure * Sensor * Catalase * Filter Paper Punches * Beaker * Control Group * Test Subject * Safety Goggles * Dropper Pipette * Go Link Procedure- 1. Gather Your Materials Figure 2 2. Put on your
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To what extent have pressure groups changed in recent years? A pressure group is an organised group that seeks to influence government policy‚ public opinions or protect or advance a particular cause or interest. Groups may promote a specific issue and raise it up the political agenda‚ represent a particular section in society or they may have more general political and ideological objectives in mind when they campaign. In this essay I am going to analyse the significant changes in the nature
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ways to find the molar mass of a substance. One way‚ if the substance is a gas‚ is to use the Ideal Gas Equation to find molar mass. The standard equation reads PV=nRT where “n” is the number of moles present‚ “P” is the pressure (which is obtained by reading the barometric pressure of the room with the class barometer)‚ “V” is the volume of the gas‚ “R” is the universal constant‚ and “T” is the temperature of the gas. The experiment’s objective is to calculate the experimental value of molar mass
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