Physics

Research question: What is the relationship between the pollution of the water and its conductivity?

Independent variable: water from different area, tap water, distilled water Dependent variable: conductivity Control variable: level of water, clean conductivity probe

Hypothesis: If the West Lake water are polluted at different level, then different ohms/voltage/current can be measure because different rate of the water conductivity.

Equipment: conductivity probe, distilled water

Method: Use the conductivity probe with logger pro to collect data, conductivity level between difference type of water.

Data Collect:
 * Type of water / 200ml || T1 / μS/cm || T2 / μS/cm || T3 / μS/cm || T4 / μS/cm || T5 / μS/cm ||
 * Tap water || 124±4 || 129±6 || 123±5 || 129±6 || 123±4 ||
 * Distilled water || -189±2 || -189±2 || -189±1 || -189±2 || -189±2 ||
 * Area 1 || 148±5 || 144±4 || 146±5 || 144±7 || 141±3 ||
 * Area 2 || 152±3 || 154±3 || 156±6 || 152±4 || 153±5 ||
 * Area 3 || 130±7 || 129±7 || 131±3 || 131±6 || 129±6 ||
 * Area 4 || 127±5 || 124±4 || 124±3 || 123±4 || 127±6 ||
 * Area 5 || 156±4 || 157±5 || 158±5 || 158±7 || 155±7 ||
 * Area 6 || 162±3 || 166±5 || 163±3 || 162±5 || 165±3 ||
 * Area 7 || 185±7 || 185±5 || 181±8 || 190±7 || 185±5 ||

Data Processing:
 * Type of water / 200ml || T1 / μS/cm || T2 / μS/cm || T3 / μS/cm || T4 / μS/cm || T5 / μS/cm || Average / μS/cm || Unc. Average/ μS/cm ||
 * Tap water || 124±4 || 129±6 || 123±5 || 129±6 || 123±4 || 126 || 5 ||
 * Distilled water || -189±2 || -189±2 || -189±1 || -189±2 || -189±2 || -189 || 2 ||
 * Area 1 || 148±5 || 144±4 || 146±5 || 144±7 || 141±3 || 145 || 5 ||
 * Area 2 || 152±3 || 154±3 || 156±6 || 152±4 || 153±5 || 153 || 4 ||
 * Area 3 || 130±7 || 129±7 || 131±3 || 131±6 || 129±6 || 130 || 6 ||
 * Area 4 || 127±5 || 124±4 || 124±3 || 123±4 || 127±6 || 125 || 4 ||
 * Area 5 || 156±4 || 157±5 || 158±5 || 158±7 || 155±7 || 157 || 6 ||
 * Area 6 || 162±3 || 166±5 || 163±3 || 162±5 || 165±3 || 164 || 4 ||
 * Area 7 || 185±7 || 185±5 || 181±8 || 190±7 || 185±5 || 185 || 6 ||



Conclusion:

//“The conductivity in water is affected by the presence of inorganic dissolved solids such as chloride, sulfate, sodium, calcium and others”(LCRA)// The difference in conductivity in lake water can come from many different reason i.e. industrial pollution, temperature, contain an organic compound like oil. Through the conclusion I have from Biology, Chemistry and ESS, the change in conductivity is the cause of pollution in water.

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