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Is the relative height between the dead weight tester and the gauge important in the calibration in gauge pressure calibration experiment?
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What is the difference between psia and psig readings?
No. Psig (pound-force per square inch gauge) is a unit of pressure relative to atmospheric pressure at sea level. By contrast, psia measures pressure relative to a vacuum (such as that in space). Most pressure gauges, such as tire gauges, are calibrated to read zero at sea level, because most applications require the difference of pressure. At sea level, Earth's atmosphere actually exerts a pressure of 14.695948804 psi. Humans do not feel this pressure because internal pressure of liquid in their bodies matches the external pressure. If a pressure gauge is calibrated to read zero in space, then at sea level on Earth it would read 14.695948804 psi. Thus a reading of 30 psig on a tire gauge, represents an absolute pressure of 44.695948804 psi. ^^^ The last sentence assumes a greater level of precision than could be obtained from most standard tire gauges. If we assume that 1 psi can be distinguished on the gauge, then the absolute pressure would have to be expressed as 45 psi.
What is absolute and relative error?
An absolute measurement is based on first principle measurements. Most measurements are comparison. An absolute measurement doesn't rely on calibration of the instrument. For example wavelength measurements can be made without calibration by looking at the number of beats per seconds (Hertz). Absolute error is the magnitude of the difference between the exaxt value of the value measured. It can be expressed as a number, e.g. the molecular weight measured is 27 000 grams per moles while the known molecular weight of the structure is 27 500, the absolute error is 500 grams per mole.
How does the relative important of bending and shearing stresses vary with the loading position of the beam?
i need the answer too..plesase anyone help me with that..now,asap
What is meant by relative size when choosing a font size?
Relative size is an option in the style tab. It means that the size should be relative or correspond to the others.
How do you calculate grains per pound from relative humidity and temperature?
Given the relative humidities at various temperatures, calculate the absolute humidities (in grains of water per pound of air) at those temperatures. The absolute humidity of the ambient air is the saturation humidity multiplied by the percentage relative humidity and divided by 100: Habs = (Hsat )(RH / 100) where: Habs = absolute humidity at a given temp Hsat = saturation humidity at the same given temp RH = percentage relative humidity at the same given temp First, you must calculate the saturation humidity at each of your temperature data points: Hsat = (7000)(18.02 / 28.85)(PS)/(Pamb - PS) where: Hsat = grains of water per pound of air 7000 = grains per pound 18.02 = molecular weight of water 28.85 = molecular weight of dry air (taken as 79 vol % nitrogen, 21 vol % oxygen) PS = vapor pressure of water at temperature T Pamb = ambient pressure (You will need a good set of steam tables to look up the vapor pressure of water at each of your temperature data points) Example calculation of Hsat at 68 oF and an ambient atmospheric pressure of 14.696 psia: From the steam tables, the vapor pressure of water is 0.3389 psia at 68 oF. Hsat = (7000)(18.02/28.85)(0.3389)/(14.696 - 0.3389) = 103.2 grains of water/lb of air Now if your relative humidity data point at 68 oF was say 60%, then: Habs = (103.2)(60/100) = 61.9 grains of water/lb of air It is quite easy to set up a spreadsheet to convert your relative humidity data as per the above example ... then all that would be needed is to enter the water vapor pressure values at each of your temperature data points. You can also just use calculator apps to do it for you - like EZ Air: http://www.parkssoft.com/ezair.html
Why do you need to calculate standard deviation and relative error?
to ensure your experiment is precise and to prevent error to happen during experiment
What is potential pressure?
the pressure of water measured relative to the atmospheric pressure at the same elevation.
What is a Vacuum in kilo pascal?
Depends on If it's absolute or relative. Vacuum in any unit is zero in absolute pressure. Vacuum in any unit is -normal air pressure in relative pressure.
What does hyperbaric mean?
high relative pressure
What is the formula to measure relative humidity?
HR= actual vapor pressure/ saturation vapor pressure
This measurment is recorded in percentages?
relative humidity
How do you calculate relative frequency probability?
You carry out an experiment repeatedly. Then the number of times that the selected even occurs divided by the total number of trials is the relative probability for that event.
Will humidity increase with air pressure increase in a closed vessel?
The relative humidity in a closed vessel will not change due to pressure. Assuming water is the fluid, the relative humidity will stabilize to 100%.
Why is relative frequencies important?
It depends on the circumstances. It is not always important
What equipment would you need to design an experiment to determine the relative humidity of the air?
a psychrometer or two thermometers
What is the definition of low pressure?
Normally pressure lower than 1018mb, Relative to sea level. that is about 30.00 in Hg
What is the pressure of the upper mantle?
somewhere between 1000 to 4000 degrees Celsius.
