Principal Sources Of Error In Thermometers
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In Chemistry, Ecosystems, Chemical Bonding What are some sources of error when obtaining a boiling point? What are some sources of error when obtaining a boiling point? SAVE CANCEL already exists. Would you like to merge this question into it? MERGE CANCEL already exists as an sources of error in experiments alternate of this question. Would you like to make it the primary and merge this question sources of error in a chemistry lab into it? MERGE CANCEL exists and is an alternate of . Merge this question into Split and merge into it SAVE CANCEL Edit Answer
Types Of Errors In Experiments
by Schnazola Confidence votes 13.2K Mainly one The primary source of error in taking a temperature reading is the thermometer, itself, and reading it properly. Standard, school-use thermometers are not precision instruments, and even very precise ones need to be
Sources Of Error In Physics
calibrated occasionally. Even if your thermometer is accurate to within one percent of the reading, a measurement of 100 degrees has an uncertainty of plus or minus one degree, meaning that the actual temperature may be anywhere between 99 and 101 degrees. Further, many instruments have a fixed error, which means they are less accurate at lower readings. Confounding matters is the error introduced by the person reading the instrument. Contamination of the sample Impurities in the sample -- either examples of experimental errors ones that were there to begin with or were introduced into the sample by contamination from the lab equipment -- can affect the boiling point of the substance being tested. Mainly one The primary source of error in taking a temperature reading is the thermometer, itself, and reading it properly. Standard, school-use thermometers are not precision instruments, and even very precise ones need to be calibrated occasionally. Even if your thermometer is accurate to within one percent of the reading, a measurement of 100 degrees has an uncertainty of plus or minus one degree, meaning that the actual temperature may be anywhere between 99 and 101 degrees. Further, many instruments have a fixed error, which means they are less accurate at lower readings. Confounding matters is the error introduced by the person reading the instrument. Contamination of the sample Impurities in the sample -- either ones that were there to begin with or were introduced into the sample by contamination from the lab equipment -- can affect the boiling point of the substance being tested. Minor edit? Save Cancel 9 people found this useful Was this answer useful? Yes Somewhat No Thanks for the feedback! Follow Clare Galterio Q&A TV hostess: Host of the hit "You & A" If any Answers users out there want to learn more about you and your career, where can they find you? View Full Interview What would you like to do? Flag Answe
particles nuclear fission nuclear fusion worked solutions▶ nuclear radii inverse sqr. law binding energy derivations▶ radioactive decay half-life inverse sqr. law E-Book D/L (pdf) Mechanics▼ contents linear motion▶ uniform
Source Of Error Definition
accln. non-uniform accln. S.H.M. 2D motion▶ projectiles circ. motion 1 relative motion kinetics▶ different types of errors in measurement Newton's Laws connected particles work & energy power & efficiency circ. motion 2 elastic strings mtm. & impulse▶ sources of error in measurement impulse conservation mtm. coefft. restitution statics▶ forces, equilibrium friction rigid bodies E-Book D/L (pdf) Waves▼ contents wave properties Huygens' Constn. interference of light diffraction of light polarization of light e/m waves http://www.answers.com/Q/What_are_some_sources_of_error_when_obtaining_a_boiling_point stationary waves beats waves in strings waves in pipes resonance Doppler effect E-Book D/L (pdf) Optics▼ contents refraction tot. int. reflection prisms convex lenses concave lenses plane mirrors concave mirrors convex mirrors telescopes microscopes the eye the camera E-Book D/L (pdf) Fields▼ contents grav. fields 1 grav. fields 2 grav. fields 3 grav. fields 4 elect. fields 1 elect. fields 2 http://www.a-levelphysicstutor.com/therm-thermometers.php capacitors 1 capacitors 2 magnetic fields 1 magnetic fields 2 e/m induction 1 e/m induction 2 E-Book D/L (pdf) Matter▼ contents intermol. force properties, defns. elasticity types of solid E-Book D/L (pdf) Thermal▼ contents thermometry thermometers calorimetry gas laws kinetic theory thermodynamics E-Book D/L (pdf) Quantum▼ contents quantum theory wave-particle duality electron diffraction photo-electric effect energy levels, ions E-Book D/L (pdf) Home >> Thermal, thermometers THERMAL PHYSICS Thermometers liquid in glass thermocouple resistance thermistor constant-volume Liquid in Glass The thermometer works by an expanding liquid in a vacuum, moving against a scale. There are a number of disadvantages to this instrument: 1.) The glass itself expands and contracts and leading to under and over reading of temperatures. 2.) Parallax errors mean readings are only 0.1oC accurate. 3.) The diameter of the bore is not consistent. 4.) Their large thermal capacity means that they do not react quickly and they may affect the temperature they are trying to measure. This is how the two liquids used in thermometers, alcoho
temperature of a substance can often result in a change in one or more of its physical properties. Thus, although temperature cannot be measured directly, its effects can be measured. Some properties of substances used to determine changes in temperature http://machineryequipmentonline.com/hvac-machinery/the-measurement-of-temperatureliquid-in-glass-thermometer-and-thermocouples/ include changes in dimensions, electrical resistance, state, type and volume of radiation and colour. Temperature measuring devices available are many and varied. Those described in this chapter are those most often used in science and industry. At the end of this chapter you should be able to: • describe the construction, principle of operation and practical applications of the following temperature measuring devices: (a) liquid-in-glass thermometer (including ad- vantages of mercury, and of error sources of error) (b) thermocouples (including advantages and sources of error) (c) resistance thermometer (including limita- tions and advantages of platinum coil) (d) thermistors (e) pyrometers (total radiation and optical types, including advantages and disadvantages) • describe the principle of operation of (a) temperature indicating paints and crayons (b) bimetallic thermometers (c) mercury-in-steel thermometer (d) gas thermometer • select the appropriate temperature measuring device for a particular application. Liquid-in-glass thermometer A sources of error liquid-in-glass thermometer uses the expansion of a liquid with increase in temperature as its principle of operation. Construction A typical liquid-in-glass thermometer is shown in Figure 25.1 and consists of a sealed stem of uniform small-bore tubing, called a capillary tube, made of glass, with a cylindrical glass bulb formed at one end. The bulb and part of the stem are filled with a liquid such as mercury or alcohol and the remaining part of the tube is evacuated. A temperature scale is formed by etching graduations on the stem. A safety reservoir is usually provided, into which the liquid can expand without bursting the glass if the temperature is raised beyond the upper limit of the scale. Principle of operation The operation of a liquid-in-glass thermometer depends on the liquid expanding with increase in temperature and contracting with decrease in temperature. The position of the end of the column of liquid in the tube is a measure of the temperature of the liquid in thebulb – shown as 15°C in Figure 25.1, which is about room temperature. Two fixed points are needed to calibrate the thermometer, with the interval between these points being divided into ‘degrees’. In the first thermometer, made by Celsius, the fixed points chosen were the temperature of
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