Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Chemical Engineering Expert

Thermometry is the science of temperature measurement.  For a thermometer to work, we infer the temperature from the change in a physical property (termed the thermometric property).  The system might be a platinum wire in which the property is resistance, a thermocouple (voltage) or a fixed gas volume (pressure). 

The common type of thermometer is termed the liquid-in-glass type.  For this type, the system is a fixed mass of liquid and the property is the volume of the liquid. For a thermometer to be effective the thermometric property should vary linearly with temperature over the required temperature range.  

795_thermometer.jpg

(a)        The first part is a test of how to deal with algebra.  Consider that we have an object of mass m, volume V and density Ρ.  The coefficient of thermal expansivity (a) is defined as:

 

896_density.png

This means that a can be specified in terms of density data, which is often more useful.

 

(b)        The data below are the densities for a number of potential thermometric materials.  These are termed 1, 2 and 3.  You should recognise that liquid 1 is water?

T (°C)

Ρ1 (kg/m3)

Ρ2 (kg/m3)

Ρ3 (kg/m3)

0

1000

808

13595

50

988

763

13473

100

958

711

13352

Using the information in the above table to show how the specific volume of each liquid varies with temperature.   You should plot a graph for each liquid and use this graph to estimate the exact value of a at 50°C for each liquid. 

Why might you find it better to plot the data for liquids 1 and 2 on a single graph, and that for liquid 3 on a separate graph?

Compare your find outd values with any useful values you can find from the literature.

What might limit the accuracy of your find outd values of α?

(c)        Can you justify which is the best choice of thermometric fluid for a glass-liquid thermometer?  This is best achieved by starting with a consideration of how you would expect the liquid to expand through the tube.

(d)        Can you list three problems with using glass/liquid thermometers to measure temperature?          

(e)        For a large number of liquids, it can be shown that the variation of specific volume (v) (at constant pressure) with temperature can be fitted with a second-order polynomial:

V = aT2+bT +c

For an ideal thermometric liquid, what conclusions can you make regarding the values of the parameters a, b and c?

(f)        A researcher suggests, as a low-cost measure, using a water-in-glass thermometer to measure temperatures as low as 1°C.  Describe the "strange" behaviour of such a thermometer between the temperatures of 1°C and 4°C. 

Note: you will need to make reference to a source of literature.

Chemical Engineering, Engineering

  • Category:- Chemical Engineering
  • Reference No.:- M914438
  • Price:- $60

Priced at Now at $60, Verified Solution

Have any Question? 


Related Questions in Chemical Engineering

A well is producing from a saturated oilreservoir with an

A well is producing from a saturated oilreservoir with an average reservoir pressureof 3000 psig. Stabilized flow test dataindicates that the well is capable of producing400 STB/day at a bottom-holeflowing pressure of 25 ...

100 moles of a fuel containing methane and butane is burned

100 moles of a fuel containing methane and butane is burned with 25% excess air in a furnace producing stack gas at 300 degrees C and 105 kPa. Determine the amount of 100 psi saturated steam that can be produced from wat ...

A solar collector design consists of an inner tube enclosed

A solar collector design consists of an inner tube enclosed concentrically in an outer tube that is transparent to solar radiation. The tubes are thin walled with inner and outer diameters of 0.10 and 0.15 m, respectivel ...

Question 1 a give three examples for each of natural free

Question 1. (a) Give three examples for each of natural (free) convection and forced convection which occur in industrial processes. (b) The Grashof number and the Reynolds number appear in most correlations of experimen ...

A draw an arbitrary closed contour on figure 711 and show

(a) Draw an arbitrary closed contour on Figure 7.11 and show that it yields zero net flow of current. (b) Suppose a capacitor is inserted into the circuit instead of any of the resistors and the current is switched on. D ...

An experiment involves heating a very small sphere that is

An experiment involves heating a very small sphere that is suspended by a fine string in air with a laser beam in order to induce the highest sphere temperature possible. After inspecting Equation 9.64, a research assist ...

An electric motor under steady load draws 97 amperes at 110

an electric motor under steady load draws 9.7 amperes at 110 volts,dellivering 0.93Kw of mechanical energy.what is the rate of heat transfer from motor ,in Kw?

A well is producing from a saturated oilreservoir with an

A well is producing from a saturated oilreservoir with an average reservoir pressureof 3000 psig. Stabilized flow test dataindicates that the well is capable of producing400 STB/day at a bottom-holeflowing pressure of 25 ...

Application convection current the solar wind is a stream

Application: Convection current. The solar wind is a stream of mostly protons emitted by the Sun as part of its normal reaction. The particles move at about 500 km/s and, at the Earth orbit, the particle density is about ...

Steam enters a converging nozzle at 800 kpa and 55315 k

Steam enters a converging nozzle at 800 kPa and 553.15 K (280°C) with negligible velocity. If expansion is isentropic, what is the minimum pressure that can be reached in such a nozzle and what is the cross-sectional are ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen