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The difference between accuracy and precision is a subtle but important one. Suppose, for example, that three students are asked to determine the mass of a piece of copper wire. The results of two successive weighings by each student are Average value Student A 1.964 g 1.978 g 1.971 g Student B 1.972 g 1.968 g 1.970 g Student C 2.000 g 2.002 g ...
Take mean global temperature for example. If the sun radiates a constant amount of energy (which it does over the long term), then the earth should remain at a fairly constant mean temperature (yet there have been many fluctuations with ice ages and warmer periods throught earth history).
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The bottom line is more independent study is needed. ( 13 , 14 ) Preliminary results of a large, $25 million government study released in 2016 found that cell phone radiation could increase the risk of malignant gliomas in the brain and schwannomas of the ear.
May 06, 2013 · In an experiment, 1.00g of propanone was completely burned in air. The heat evolved raised the temperature of 150g of water from 18.8oC to 64.3oC. Use this data to calculate the enthalpy of combustion of propanone (the specific heat capacity of water is 4.18Jg-1K-1)
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The first type includes pressure, temperature, flow, force, vibration, mass and density. The second includes such measurements as conductivity, pH and chemical analysis. Obtaining, maintaining and improving the quality of these measurements is the goal of proper signal conditioning.
For example in the melting of ice at 273.0 K, no matter what temperature the surroundings are — from 273.1 K to even 500 K and higher, the temperature of the ice will stay at 273.0 K until the last molecules in the ice are changed to liquid water, i.e., until all the hydrogen bonds between the water molecules in ice are broken and new, less ...