Guest anaoum Posted February 21, 2005 Share Posted February 21, 2005 hello, i am designing an experiment to see the relationship between the electrical conductivity of salt water and the temperature of the salt water. can some one help me by giving a good and accurate way of measuring the conductivity. thanks Link to comment Share on other sites More sharing options...
YT2095 Posted February 21, 2005 Share Posted February 21, 2005 you`ll need an Ameter, a peice of kit that allows you to read current flow, most good digital multi-meters have a current (Amps) setting on them. put this in series with your power supply, and gently heat your salt water with a thermometer in the liquid. then write down the meter reading for every degree C rise in temp. you can then use this data to plot a chart Link to comment Share on other sites More sharing options...
5614 Posted February 21, 2005 Share Posted February 21, 2005 if you repeat the experiment remember that salt greatly increases the electrical conductivity of water so add the same amount each time. useful equation would be: voltage = current x resistance or current = voltage/resistance or resistance = voltage/current Link to comment Share on other sites More sharing options...
YT2095 Posted February 21, 2005 Share Posted February 21, 2005 or just apply Ohms law *Sigh* Link to comment Share on other sites More sharing options...
Lance Posted February 21, 2005 Share Posted February 21, 2005 Better yet, just break out your handy dandy multimeter and turn it to its resistance setting. Link to comment Share on other sites More sharing options...
Lance Posted February 21, 2005 Share Posted February 21, 2005 Also, dont forget that the distance between the probes will vary the resistance. Link to comment Share on other sites More sharing options...
YT2095 Posted February 21, 2005 Share Posted February 21, 2005 cor blimey, you`ll be taking into account local heating of the electrodes next and making demands that a magnetic stirrer be used to dispate this Link to comment Share on other sites More sharing options...
boxhead Posted February 21, 2005 Share Posted February 21, 2005 hello' date=' i am designing an experiment to see the relationship between the electrical conductivity of salt water and the temperature of the salt water. can some one help me by giving a good and accurate way of measuring the conductivity. thanks[/quote'] digital multimeter with temperature scale is the best solution. Link to comment Share on other sites More sharing options...
YT2095 Posted February 21, 2005 Share Posted February 21, 2005 We`de already established that dude Link to comment Share on other sites More sharing options...
boxhead Posted February 21, 2005 Share Posted February 21, 2005 We`de already established that dude oh i am sorry. Link to comment Share on other sites More sharing options...
YT2095 Posted February 21, 2005 Share Posted February 21, 2005 no worries, it does pay to read a thread before posting though Link to comment Share on other sites More sharing options...
5614 Posted February 21, 2005 Share Posted February 21, 2005 it does pay to read a thread before posting though if i read it 5 times how much do i get? Link to comment Share on other sites More sharing options...
YT2095 Posted February 21, 2005 Share Posted February 21, 2005 a lower probability of making an ass of yourself for the sake of NOT reading it, and no points added for the fact you had to read it 5 times as that shows a lacking in cognitive and mental retention abilities, but hey, it`s you `puter and inet time Link to comment Share on other sites More sharing options...
5614 Posted February 21, 2005 Share Posted February 21, 2005 damn, i was hoping there was some cash involved Link to comment Share on other sites More sharing options...
YT2095 Posted February 21, 2005 Share Posted February 21, 2005 cash, how common and cheap! now then, Back on Topic, or I might just have to pay Sayo to do nasty, horrible and deplorable things to your account here! )) Link to comment Share on other sites More sharing options...
Tetrahedrite Posted February 21, 2005 Share Posted February 21, 2005 You don't actually have to do this experiment, conductivity at different temperatures (and concentrations) can be calculated using the Nernst Equation. Link to comment Share on other sites More sharing options...
Lance Posted February 21, 2005 Share Posted February 21, 2005 You don't actually have to do this experiment, conductivity at different temperatures (and concentrations) can be calculated using the Nernst Equation. You dont "need" to do 99% of the things they make you do in school. Link to comment Share on other sites More sharing options...
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