T+e $ti(it, ims to demonstrte t+e mesurement o# dr, %u!% nd -et %u!% temperture using t+e s!ing ps,$+rometer nd t+e ps,$+rometri$ $+rt.
T+e students s+!! %e %!e to: .& Mesure t+e dr, %u!% %u!% nd -et %u!% tempertures tempertures o# t+e surrounding surrounding tmosp+ere tmosp+ere using t+e s!ing ps,$+rometer. . "e(e!op pro#ession! pro#ession! -or0 et+i$s1 et+i$s1 in$!uding in$!uding pre$ision1 pre$ision1 netness1 netness1 s#et, nd %i!it, to #o!!oinstru$tion.
Air is $omposed o# nitrogen1 ox,gen1 nd sm!! mounts o# -ter (por. Nitrogen m0es up 7731 -+i!e ox,gen $$ounts #or 23. 4ter (por $n $$ount #or 5 to 23 under $ertin $onditions. 4ter (por is mesured in grins or1 in some $ses1 pounds per pound o# dr, ir. Se(en t+ousnd )71555* grins o# -ter e6u! one pound. Temperture determines t+e mount o# -ter (por t+t ir $n +o!d. Hotter tempertures men t+t ir +s greter $p$it, to +o!d -ter suspended. 4ter is $ondensed out o# ir s it is $oo!ed. Outside1 -ter $ondenstion %e$omes rin. Inside1 it %e$omes $ondenstion on t+e -indo- g!ss. T+us1 dr, ir $ts some-+t !i0e sponge. It %sor%s moisture. T+ere re #our properties o# ir t+t $$ount #or its %e+(ior under (r,ing $onditions. T+ese properties re dr, %u!% temperture1 -et %u!% temperture1 de- point temperture1 nd re!ti(e +umidit,. T+ere re $ertin mounts o# -ter (por per pound o# dr, ir. T+e, $n %e p!otted on ps,$+rometri$ $+rt. Ps,$+ro is is ree0 term mening 8$o!d.9 A ps$,$+rometer ps$,$+rometer is n instrument #or mesuring t+e 6uous (por in t+e tmosp+ere. A di##eren$e %et-een -et %u!% t+ermometer nd dr, %u!% t+ermometer is n indi$tion o# t+e dr,ness o# t+e ir. A ps,$+rometer ps,$+rometer11 t+en1 is +,grometer1 -+i$+ is de(i$e #or mesuring -ter $ontent in ir. A ps,$+rometri$ ps,$+rometri$ $+rt indi$tes t+e di##erent (!ues o# temperture nd -ter moisture in ir. T+e dr, %u!% temperture is !o$ted in one p!$e nd t+e -et %u!% in not+er. I# t+e t-o re 0no-n1 it is es, to #ind t+e re!ti(e +umidit, nd ot+er #$tors re!ting to ir %eing $+e$0ed.
To o%tin t+e re!ti(e +umidit, o# ir it is ne$essr, to use t-o t+ermometers. One t+ermometer is dr, %u!% t+e ot+er is -et %u!%. T+e de(i$e used to mesure re!ti(e +umidit, is t+e s!ing ps,$+rometer . It +s t-o g!ss;stem t+ermometers. T+e -et %u!% t+ermometer is moistened %, -i$0 tt$+ed to t+e %u!%. As t+e du! t+ermometers re -+ir!ed1 ir psses o(er t+em. T+e dr, nd -et %u!% tempertures re re$orded. Re!ti(e +umidit, is determined %, grp+s1 s!ide ru!es1 or simi!r de(i$es. A s!ing ps,$+rometer is n instrument t+t mesures re!ti(e +umidit, ) +,grometer*. T+e s!ing +s t-o t+ermometers1 dr, %u!% nd -et %u!% t+ermometer1 mounted toget+er on $+in. T+e -et %u!% t+ermometer is -rpped in mus!in t+t is moistened -it+ disti!!ed -ter. T+e user t+en s-ings t+e s!ing unti! t+e tempertures st%i!is 'ust esier to pu!! out de(i$e nd red t+e s$reen. Addition!!,1 %esides %eing $um%ersome nd time $onsuming1 s!ings $ontin mer$ur,1 +<rdous mteri!1 nd must %e +nd!ed -it+ $re. A s!ing -i!! t,pi$!!, red ?;&53 +ig+ due to user error. Some o# t+e mist0es t+t $n %e mde -+i!e using s!ing re: &. I# t+e so$0 on t+e -et %u!% t+ermometer is not $!en1 t+e +umidit, mesured #rom s!ing -i!! err on t+e +ig+ side. . I# t+e -ter used #or t+e -et %u!% t+ermometer is not disti!!ed -ter1 t+e +umidit, mesured #rom s!ing -i!! err on t+e +ig+ side. 2. I# t+e s!ing is not s-ung round !ong enoug+1 t+e +umidit, mesured #rom s!ing -i!! err on t+e +ig+ side. @. I# t+e t+ermometer mesurements re not red 6ui$0!, enoug+ #ter s-inging t+e s!ing1 t+e +umidit, mesured #rom s!ing -i!! err on t+e +ig+ side. ?. I# t+e $+rts used to interpret t+e resu!ts re not #or t+e sme !titude -+ere t+e redings -ere t0en1 t+e +umidit, -i!! %e in$orre$t. Addition!!,1 t+e $+rts re on!, (i!%!e in &55 in$rements1 nd it is o#ten di##i$u!t to determine t+e ex$t !titude o# t+e user. S!ing ps,$+rometers re t+e stndrd #or $$urte!, mesuring m%ient temperture nd +umidit,. E(er, meteoro!ogist s+ou!d 0no- +o- to use one $orre$t!,. &. Inspe$t t+e $otton -i$0 on t+e s!ing ps,$+rometer nd m0e sure t+t it is in good $ondition nd #irm!, in $ont$t -it+ t+e t+ermometer %u!%. A ps,$+rometer -it+ ,e!!o-ed or #r,ed -i$0 -i!! not gi(e n $$urte reding1 nd t+e -i$0 s+ou!d %e rep!$ed. "o not tou$+ t+e -i$0 -it+ ,our #ingers1 %e$use $ontminnts -i!! ##e$t t+e $$ur$,.A!so1 $+e$0 #or seprted mer$ur, $o!umn.
. T+oroug+!, sturte t+e -i$0 -it+ disti!!ed -ter. I# t+e -ter %eds up nd does not esi!, so0 in1 t+e -i$0 s+ou!d %e rep!$ed. 2. B$e into t+e -ind )i# n,* nd %egin s-inging t+e ps,$+rometer t sted,1 $om#ort%!e p$e )%out turns per se$ond is good*. =e extreme!, $re#u! t+t ,ou don>t stri0e t+e ps,$+rometer on ner%, t%!e1 ri!ing1 or ot+er o%stru$tion A!so1 0eep it #r enoug+ #rom ,our %od, t+t ,ou don>t pi$0 up ,our o-n %od, +et. @. A#ter %out & minute1 stop nd $+e$0 t+e -et;%u!% temperture1 6ui$0!, reding it to t+e nerest &D&5 degree )i# ,ou stop too !ong1 t+e temperture -i!! strt to $+nge*. T+en $ontinue s-inging t+e ps,$+rometer #or not+er minute or so. C+e$0 t+e -et;%u!% temperture gin nd see -+et+er it +s $+nged #rom ,our pre(ious reding. I# it +s1 $ontinue s-inging #or not+er minute nd $+e$0 gin. Repet s ne$essr,. Your go! is to get t+e !o-est possi%!e reding out o# t+e -et %u!% t+ermometer )ssuming t+t it strted out ner t+e dr, ir temperture*. Importnt note: m0e sure t+t t+e -i$0 does not %e$ome too dr,. I# it does1 ,ou -i!! need to dd not+er drop or t-o o# disti!!ed -ter nd strt o(er. ?. Cre#u!!, %ut 6ui$0!, red nd re$ord t+e n! -et %u!% nd dr, %u!% tempertures to t+e nerest 5.& degree1 interpo!ting %et-een ti$0 mr0s s ne$essr,. . Use -+te(er met+od is (i!%!e )ps,$+rometri$ $omputer1 S0e-;T digrm1 or t%!e* to $ompute t+e de-point nd re!ti(e +umidit,. Importnt Tips: Most %eginners do not t0e $$urte ps,$+rometer redings %e$use o# t+e #o!!o-ing $ommon mist0es: )&* not (enti!ting t+e ps,$+rometer !ong enoug+ to re$+ e6ui!i%rium )* not getting t+e -i$0 -et enoug+1 or !etting it dr, out )2* +o!ding it too $!ose to t+e %od, or t0ing too !ong to red t+e t+ermometers )@* tou$+ing t+e %u!% ends -it+ t+e +nds -+i!e reding )?* not #$ing into t+e %ree
T+e S!ing Ps,$+rometer
T+e Ps,$+rometri$ C+rt )Metri$ Units*
T+e Ps,$+rometri$ C+rt in Eng!is+ Units
S!ing Ps,$+rometer Ps,$+rometri$ C+rt Stop -t$+
&. C+e$0 t+e s!ing ps,$+rometer to ensure t+t t+ermometers re proper!, se$ured. . 4et t+e -i$0 o# t+e -et %u!% t+ermometer unti! it is sturted. 2. T+e instru$tor s+ou!d designte t+e !o$tions )inside t+e $mpus* -+ere mesurements o# -et %u!% nd dr, %u!% temperture re to %e per#ormed. @. To get t+e dr, %u!% nd -et %u!% tempertures1 -+ir! t+e s!ing ps,$+rometer #or %out minutes -it+in t+e designted !o$tions. =e sure t+e s!ing ps,$+rometer -i!! not +it n,%od, -+i!e it is %eing -+ir!ed. Repet t+is pro$edure #or t !est t+ree di##erent res in t+e designted !o$tions.F ?. Repet pro$edure @ in !! t+e designted !o$tions. . Use t+e ps,$+rometri$ $+rt to get t+e ot+er properties o# ir re6uired %, t+is experiment.
P!$e: GGGGGGGGGGGGGGGGGGGGGG "te: GGGGGGGGGGGGGGGGGGGGGG Time: GGGGGGGGGGGGGGGGGGGGG
/o$tion
Tri!s
"r, =u!% Temp
4et =u!% Temp
Re!ti(e Humidit,
Spe$i#i$ Humidit,
3 Sturtion
& 2 & 2 & 2 & 2
Note: Re!ti(e Humidit,1 Spe$i#i$ Humidit,1 nd 3 sturtion $n %e t0en #rom t+e ps,$+rometri$ $+rt.
Re(ision SttusD"te:5D.55I Septem%er 5I
CRITERIA
Mnipu!ti(e S0i!!s Experiment! Set;up
=EINNER & Mem%ers do not demonstrte needed s0i!!s. Mem%ers re un%!e to set;up t+e mteri!s.
ACCEPTA=/E
PROBICIENT 2
Mem%ers o$$sion!!, demonstrte needed s0i!!s. Mem%ers re %!e to set; up t+e mteri!s -it+ super(ision. Mem%ers o$$sion!!, demonstrte trgeted pro$ess s0i!!s.
Mem%ers !-,s demonstrte needed s0i!!s. Mem%ers re %!e to set; up t+e mteri! -it+ minimum super(ision. Mem%ers !-,s demonstrte trgeted pro$ess s0i!!s.
Pro$ess S0i!!s
Mem%ers do not demonstrte trgeted pro$ess s0i!!s.
S#et, Pre$utions
Mem%ers do not #o!!os#et, pre$utions.
Mem%ers #o!!o- s#et, pre$utions most o# t+e time.
Mem%ers #o!!o- s#et, pre$utions t !! times.
Time MngementD Condu$t o# Experiment Cooperti(e nd Tem-or0
Mem%ers do not #inis+ on time -it+ in$omp!ete dt.
Mem%ers #inis+ on time -it+ in$omp!ete dt.
Mem%ers #inis+ +ed o# time -it+ $omp!ete dt nd time to re(ise dt.
Mem%ers do not 0not+eir ts0s nd +(e no de#ined responsi%i!ities. roup $on#!i$ts +(e to %e sett!ed %, t+e te$+er.
Netness nd Order!iness
Mess, -or0p!$e during nd #ter t+e experiment.
A%i!it, to do independent -or0
Mem%ers re6uire super(ision %, t+e te$+er.
Mem%ers +(e de#ined responsi%i!ities most o# t+e time. roup $on#!i$ts re $ooperti(e!, mnged most o# t+e time. C!en nd order!, -or0p!$e -it+ o$$sion! mess during nd #ter t+e experiment. Mem%ers re6uire o$$sion! super(ision %, t+e te$+er.
Mem%ers re on ts0s nd +(e responsi%i!ities t !! times. roup $on#!i$ts re $ooperti(e!, mnged t !! times. C!en nd order!, -or0p!$e t !! times during nd #ter t+e experiment. Mem%ers do not need to %e super(ised %, t+e te$+er.
L
x &553
SCORE
