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

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

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

or just apply Ohms law *Sigh*

Better yet, just break out your handy dandy multimeter and turn it to its resistance setting.

Also, dont forget that the distance between the probes will vary the resistance.

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

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.

We`de already established that dude

We`de already established that dude

 

oh i am sorry.

no worries, it does pay to read a thread before posting though

it does pay to read a thread before posting though

if i read it 5 times how much do i get?

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

damn, i was hoping there was some cash involved

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! ))

You don't actually have to do this experiment, conductivity at different temperatures (and concentrations) can be calculated using the Nernst Equation.

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.