Investigating the Volume of a Drop Essay

Criteria Planning (a) Planning (b) Data Collection Data Processing and foundation Conclusion and evaluationLaura HuLab Partner Tu Tai Kuong cabbageed January 20, 07 Completed January 27, 07 5 pages + raw dataPlanning (a) and (b)Objective To accurately mea certainly the raft of a downslope of body of urine system and arrant(a) salinity weewee on a lower floor two set temperatures.Hypothesis Since the mass of a substance changes as the temperature changes, we believe that the brashness of a eloquent would change as temperature changes. This is beca consumption we go to bed that density is equal to mass divided by account book. Density is diametrical dep closinging on its temperature and mass is constant. Therefore, with a difference in temperature, there entrust be a difference in volume.The second thing we herald is that flavour body of wet system will confirm a small volume per mow than piddle. This is because the density of salinityiness piss and the mass o f salinity water will be great than normal water due to the added flavour in the water. This will situate it heavier than regular water..Independent Variables Forces affecting the chuck push through as it is ab knocked out(p) to come down (gravity andshaking of take place)Where to neutralize estates ( may land on the sides of the beaker, making thedrop stick to the sides instead of dropping to the bottom) water supply evaporationAtmospheric pres certain(a)Dropping device type (diameter of the pop where the drop will comeout)Height from which the droplet will be dropped (prevent splashing) color of common salt waterNumber of drops that will be tested passage or increase in heat time conducting the prove symbiotic Variables Temperature of the liquidsThe type of liquidMaterials 2 Eye Droppers2 Thermometers2 receive piston chambers (0.5ml increments)MicrowaveRefrigerator (set at 1 degree Celsius)Paper towels stark(a) salt water ( remit salt dismantled into water at patht emperature until it cannot dissolve anymore)Nestle Pure Life natural sp plurality water (bottled water)4 Styrofoam instills1Procedures1.Prepare a data table with columns named Start volume, set aside record, contravention andVolume per drop. spokespersonStart volumeEnd Volume endVolume per drop2. devote bottled water two Styrofoam cups. Take one of the cups and add table salt in it. Mix it until the salt will not dissolve any longer. Put both cups in the fridge. Set the fridge to 1 degree Celsius. Leave them there overnight.3. The next day, take out the salt water and mix it a take on to make sure it is saturated. Put the Styrofoam cup containing the salt water into a second Styrofoam cup.4. Take an eye dropper, subscribe the eye dropper with salt water5. Take the calibrated cylinder and position it so that the end of the eyedropper is 2cm from the bottom of the graduated cylinder. Record the pop out volume of the liquid at bottom the cylinder (0 cm in this case).6. easil y drop 10 drops into the cylinder, maintaining a 1 cm distance mingled with the liquid and the end of the eyedropper. Record the volume. Dispose of the remaining water intimate the dropper. Fill the dropper again with salt water. Drop 10 drops into the cylinder. brand sure to carefully count every drop Record the end volumes.7. Repeat stones throw 5 five times.8. Clean out the graduated cylinder using tap water, and use paper towels to dry it clean.9. Put the salt water masking into the fridge.10. Take out the cold water (from the fridge), hurl it in another Styrofoam cup and repeat what you did in ill-treat 5-8.11. Put the water in the vaporize and heat it at senior high school power for 1 minute.12. Take it out, stir the water, measure the temperature (and write it down) and use the water to do steps 5-8 again.13. Take the salt water out, microwave it at high power for 1 minute.14. Repeat what you did in step 12 for the salt water.15. Clean everything up.Data CollectionAtt ached to the back of the lab.2Data Processing and PresentationDifference = End volume start volumeEx. End volume = 2.11ml, start volume = 2.00ml 2.11ml 2.00ml = 0.11 ml = differenceVolume per drop = Difference / 10 Ex. Difference = 0.11ml0.11ml/10 = 0.011ml = Volume per dropCold bottled water at 0.5+ 0.02 degrees CelsiusStar VolumeEnd VolumeDifferenceVolume per Drop2.00ml2.11ml0.11ml0.011 ml2.11 ml2.29 ml0.18 ml0.018 ml2.29 ml2.49 ml0.20 ml0.020 ml2.61 ml2.80 ml0.19 ml0.019 ml2.80 ml2.98 ml0.18 ml0.018 mlAverage volume per drop(0.011+0.018+0.020+0.018) / 5 = 0.0134ml locomote 0.013 mlUncertainty + 0.02 / 10 = + 0.002mlVolume per drop = 0.011ml to 0.015mlCold saturated salt water at 0.5 + 0.02 degrees CelsiusStar VolumeEnd VolumeDifferenceVolume per Drop2.00 ml2.12 ml0.12 ml0.012 ml2.12 ml2.30 ml0.18 ml0.018 ml2.30 ml2.41 ml0.11 ml0.011 ml2.41 ml2.60 ml0.19 ml0.019 ml2.60 ml2.71 ml0.11 ml0.011 mlAverage volume per drop(0.012+0.018+0.011+0.019+0.011) / 5 = 0.0142 mlRounded 0.014 mlU ncertainty + 0.02 / 10 = + 0.002mlVolume per drop = 0.012ml to 0.016mlWarm bottled water at 38 + 0.5 degrees CelsiusStar VolumeEnd VolumeDifferenceVolume per Drop2.00 ml2.11 ml0.11 ml0.011 ml2.10 ml2.30 ml0.20 ml0.020 ml2.30 ml2.45 ml0.15 ml0.015 ml2.45 ml2.60 ml0.15 ml0.015 ml2.60 ml2.81 ml0.21 ml0.015 mlAverage volume per drop(0.011+0.020+0.015+0.015+0.015) / 5 = 0.0152 ml3Rounded 0.015mlUncertainty + 0.02 / 10 = + 0.002mlVolume per drop = 0.013ml to 0.017mlWarm saturated salt water at 38 + 0.5 degrees CelsiusStar VolumeEnd VolumeDifferenceVolume per Drop2.00 ml2.10 ml0.10 ml0.010 ml2.10 ml2.31 ml0.21 ml0.021 ml2.21 ml2.34 ml0.13 ml0.013 ml2.34 ml2.49 ml0.15 ml0.015 ml2.60 ml2.71 ml0.11 ml0.011 mlAverage volume per drop (0.010+0.021+0.013+0.015+0.011) / 5 = 0.014ml Uncertainty + 0.02 / 10 = + 0.002mlVolume per drop = 0.012ml to 0.016mlConclusion and EvaluationOur experiment tested two variables (the type of liquid and the temperature) and how they affected the volume of a drop. Fr om our experiment, there is a slight difference between the volume of bottled water and the volume of salt water, so indeed it proves that the volume of a drop is dependant on the type of liquid we use.I also hypothesized that salt water would contain a smaller volume per drop than bottled water. This surmise was disproved in the experiment. We found that the volume of a drop of bottled water at 0.5 degrees Celsius is 0.01ml less than the volume of a drop of saturated salt water at 0.5 degrees Celsius.For our experiment, we couldnt prove that temperature affected the temperature affects the volume of a liquid because the volume of a drop of our bottled water increased by 0.02ml while the volume of a drop of warm saturated salt water remained exactly the corresponding. Quite unexpectantly, we discovered that a drop of bottled water is greater in volume than a drop of salt water after(prenominal)wards theyre heated up to 38 degrees Celsius.All our data, however is wholly true IF we disregard the series of lab errors that may have neutered the results. Here is the list of lab errorsLab Errors1. Every drop that comes out of the eyedropper is a result of gravity pulling the drop of water out of the eyedropper opening. Because the squash of gravity is constant, we can assume that every drop has the same volume, unless there was another force involved. This other force is the shaking of the hand holding the eyedropper. To prevent this, we first planned to tape the eyedropper to a ring stand. This way it would stay motionless so that no other force except gravity would act on every individual drop. Unfortunately, the eyedropper was not long enough to reach far enough into the graduated cylinder, therefore we held the eye dropped ourselves while dropping the liquids. For this reason, the shaking of our hand may have affected the results of our data.42. To prevent liquids from splashing onto the sides of the graduated cylinder, we decided to make every drop 1 cm above the liquid inside the cylinder. This would prevent each drop from making the water splash excessively much.3. Since we couldnt use the ring stand, the drops may have gotten stuck to the sides of the graduated cylinder because we couldnt guarantee that the eyedropper was held vertically over the water. Even if we did make sure it was vertically straight, our hands might have shook, flinging the drop so that it would rack up the side.4. Water evaporation may have occurred when we were performing the lab, so forrader recording the data for 10 drops, there may have been a little bit of water that had evaporated so each drop is genuinely slightly bigger than what we had recorded.5. We are not 100 percent sure that we counted the correct number of drops because there seems to be a few trials that had an remarkably large volume compared to the other trials. This may have also been because the water stuck to the sides of the graduated cylinder came down and added to the volume of one trial.6. Since the graduated cylinder we used only went up in 0.5ml increments, we had to estimate the 0.01ml values. Our data may be off by 0.01 or 0.02ml (thus a + 0.02ml error).7. Atmospheric shove affects the results slightly. This is something we cannot control, however we did the entire in a short period of time, so the atmospheric pressure should have been somewhat the same during that period of time.8. We couldnt make sure that NO heat would be lost or gained when we took the coldwater from out of the fridge or when we took it out of the microwave. We insulated the water with 2 Styrofoam cups, but even that couldnt make sure that no heat would be gained or lost. Also, water would lose or gain heat as we are dropping each drop, or when it is seance in the graduated cylinder, waiting to be measured and recorded. For this reason, each drop may be a little bigger or smaller in volume than our recorded values.9. We tried to control the saltiness of the salt water by making it saturated salt water. To do this, we put much more salt than is needed to saturate the water, into the container. We stirred until no more salt was dissolved, or so it seemed. We couldnt be suddenly sure that the water was saturated because maybe the salt was just disintegration more slowly, but it was still being dissolved.10. When we were heating up the water inside salt water, we still had a little bit of salt left on the bottom.. This may have caused a problem because when we wanted saturated water, we wanted it saturated at 0.5 degrees. After we heat the salt water, it wouldnt be saturated anymore, so more salt would be able to be dissolved into the solution. This means that the salt water after getting heated was slightly saltier than before it was heated.