- #1

TheNovice11

- 1

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## Homework Statement

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After doing a lab on air compressors, we were asked to

**calculate**Error in Pressure, Temperature and time measurements taken (all at 30 second intervals). We took pressure and temperature values at time = 0,30,60,90,120,150 and 180 seconds. We repeated the experiment 5 times. Before each repetition, we took atmospheric pressure and temperature. The values of n I calculated using equation 2 were:

1.01347534,

1.015041506

1.015031517

1.01798942

1.019624199

We were asked

1) What type of compression is occurring (Isothermal, Isentropic or Polytropic)?

2) Are the Values on n equal from each set of data?

3) Do they increase or decrease when placed in chronological order?

4) Explain the cause of any differences?

5)

**What is the uncertainty in pressure, temperature and time measurements?**

## Homework Equations

(P1)(V1)^n = (P2)(V2)^n (1)

n = (ln(Pf/P0))/(ln(Pf/P0)-ln(Tf/T0)) (2)

## The Attempt at a Solution

My attempt at a solution is partly explained under the 'problem statement' section. However, I have found that we also probably need to use the Root Mean Square to calculate the uncertainty in each of our values, by manipulating Equation 1 possibly? I also included questions 1-4 as maybe they are needed to answer question 5. I will be on this forum constantly to clarify anything. Thank you