Experiment 301 C. Summary In Expe Experi rime ment nt 301, 301, the the leng length th of the the alum alumin inum um meta metall tube tube was measured. The tube was then properly fitted on the expansion base. The init initial ial temp tempera eratu ture re of the the tube tube room room temp temper erat ature ure!! was was dete determi rmined ned by obtaining the resistan"e of the thermistor using a digital multi#tester. The dial gauge was set to its initial reading. $ little amount of water was heated using the steam generator in order for linear expansion to ta%e pla"e. The reading of the dial gauge was re"orded at this instan"e. The resistan"e of the tube during its hot phase was a"&uired through the digital multi#tester, prod produ" u"in ing g the the resp respe" e"ti ti'e 'e temp temper erat atur ure e of the the meta metall tube tube.. The The same same pro"edures also apply to the "opper metal tube. The main ob(e"ti'e of the experiment is to "ompute for the "oeffi"ient of linear expansion )!. ) is the ratio of the "hange in length to the original leng length th for for e'er e'ery y degr degree ee "han "hange ge in temp temper erat atur ure. e. *y "arr "arry ying ing out out the the experiment, four different 'alues were obtained. These are the initial length +o!, in"r in"rea ease se in leng length th +! +!,, whi"h hi"h is obta obtain ined ed from from "on' "on'er erti ting ng the the measured measured di'isions from the dial gauge to mm, initial initial temperature trm! and the final temperature thot!. The "hange in temperature is denoted by t whi" whi"h h is "al" "al"ul ulat ated ed by subt subtra" ra"ti ting ng the the init initial ial temp temper erat ature ure to the the final final temp tempera eratu ture. re. *y plugg pluggin ing g the the 'alu 'alues es of +, +, +o and t in the e&uation ¿
∆L Lo ∆ t
, the experimental 'alue of the "oeffi"ient of linear expansion is
obtained. Elaborating further, linear expansion is a type of thermal expansion. Ther Therma mall expa expans nsio ion n has has thre three e type typess- line linear ar,, area area and and 'olu 'olume me.. In the the experiment, the linear type is solely "onsidered. *y "riti"al obser'ations, temperature and thermal expansion go along with ea"h other. These two are dependent &uantities. hene'er temperature is in"reased, expansion ta%es pla"e / similar to what o""urred in the two metal tubes. $s steam was generated, they both produ"ed an in"rease in length. It "auses a transformation in the dimensions of a "ertain material. This is the most signifi"ant "on"ept of Experiment 301.
. uide 2uestions 1. a'ing an in"orre"t reading of the resistan"e in the digital multi#tester would produ"e a wrong 'alue of the initial and final temperatures. $lso, a"&uiring ina""urate 'alues for the in"rease in length through the use of the dial gauge will produ"e erroneous results. In order to minimi4e these errors, there must be %een obser'ation in anything that happens through the "ourse of the experiment. 5. The result will not 'ary. The aluminum and "opper metal tubes will still be heated by the "ondensed water e'en if it is not drained. In this manner, the resistan"e readings of the digital multi#tester will almost be the same. 3. +et x6aluminum and y6"opper. Sin"e, x65a! and y63a!, the two metals would ha'e the following "oeffi"ients of linear expansionE. $nalysis 1. a'ing an in"orre"t reading of the resistan"e in the digital multi#tester would produ"e a wrong 'alue of the initial and final temperatures. $lso, a"&uiring ina""urate 'alues for the in"rease in length through the use of the dial gauge will produ"e erroneous results. In order to minimi4e these errors, there must be %een obser'ation in anything that happens through the "ourse of the experiment. 5. The result will not 'ary. The aluminum and "opper metal tubes will still be heated by the "ondensed water e'en if it is not drained. In this manner, the resistan"e readings of the digital multi#tester will almost be the same. 3. In performing the experiment, the temperature mainly affe"ts the in"rease in length of the material. $s the temperature in"reases, the extent at whi"h the material expands is rea"hed. They are dire"tly proportional to ea"h other.
7. Con"lusion $ssessing the results of the experiment, I therefore "on"lude that as temperature rises, expansion is most li%ely to o""ur. 8aterials that are sub(e"ted to "hanges in temperature will undergo "hanges in its dimensions. $dditionally, the amount of expansion of a material relies on the 'alue of its "oeffi"ient of linear expansion. The higher its "oeffi"ient of linear expansion, the more it will expand. +inear expansion is a type of thermal expansion. Thermal expansion is mainly "on"erned about temperature and the "hanges in dimension of a material. +oo%ing at the bigger pi"ture, thermal expansion is &uantified in Thermodynami"s. *eing a Chemi"al Engineering student, Thermodynami"s is of great importan"e. Thermodynami"s is "entered in studying heat and it is essential for the o""urren"e of 'arious "hemi"al rea"tions. eat is found in almost e'ery part of Chemistry. It is a 'ital part of what Chemi"al Engineering is all about.
