Answer Happy

Time, (t±0.5) (min) 3 6 8 Mass, (m+0.008) (mg) 1.069 0.912 0.774 0.637 0.474 0.325 15 a. Carefully draw a fully-labelled graph of the mass of water versus time in your logbook (you can use EXCEL and copy the graph into your logbook document). Start both axes at zero and show the error bars. Watch the video on graphing with Excel for tips. b. Draw the lines of best and worst fit for the data. c. What is the rate of evaporation and its uncertainty in mg/s? 10 Physical Modelling Home Laboratory Manual 2022 d. What was the mass of the water drop just after it was placed on the scales? Also state the uncertainty. e. How long will it take for the water drop to completely evaporate? What is the uncertainty in this answer? 9 12 15
Graphing Graph your results in a Mass (on vertical axis) vs Volume (on horizontal axis) graph. Consider the following when drawing a graph. Consider the following: 1. When creating a graph we need to first choose our axes. As we are determining density, which is defined as mass over volume, we can set our y-axis as mass and the x - axis as volume so that our gradient will give the volume. LABEL the axes and include the units for the quantity. 2. The second step to creating a graph is choosing the range of values for the axes. We choose the values for our axes based on two things. The first is to use multiples that are easy to manipulate e.g. 1,2,5, 10, 20, 50, or 100 etc. The second is to spread out our data so we can see what is going on. So look at your values and decide what will be your minimum and maximum value for each axis. Axis values are equally spaced apart. 3. We plot our points. This is not as simple as it might seem. You not only have to plot your points but also your error bars on every point. A point at position V1 will have an error bar that extends AV to the negative side of V1 and AV to the positive side of V1. Don't forget there are also error bars corresponding to ± Am. Watch the video on plotting with Excel if you want to do your graph on a computer. 4. Once we have plotted our points we include a line of BEST FIT, this is the best line that fits through the points. It is NOT dot to dot. If it does not go directly through the points then there should be a equal, random scattering of points above and below the line. 5. Finally we need a line of WORST FIT to determine our uncertainty. We can include two o these lines to obtain an upper and lower limit to our uncertainty. + 6. Lastly, label your graph, e.g Figure 3. Graph of Mass (g) vs Volume (mL), and check the : y axes are labelled.
Table 1. Volume of water and corresponding mass Volume(ml) Mass(grams) 200 300 400 500 600 Volume(ml) 700 800 900 Mass(grams)