so here is our setup for our first experiment to find out what temperature yeast would produce the most carbon dioxide so i've set up the four boiling tubes in each of the different variables so a is cold water b is 36 degrees c is 56 degrees and d is 76 degrees so first of all i'm making sure that the right temperature is in each of the beakers i've put the same amount of yeast in each one and now what we're going to do is activate each one with the glucose and solution and then we're going to time five minutes to see which one produces a froth and we're going to measure the froth so i've already got my record sheet ready and i have my timer at hand to time the five minutes so i'm using a pipette to make sure that each of the boiling tubes has the same amount of solution so it's a fair test and i'm going to start the five minutes when once they've all been filled up so i'm going to put four pipettes of water in each one of the tubes make sure it's it's well mixed and then pop the so now they're all established i'm going to time the first five minutes now on this area here i'm going to make notes of what i observe in this five minutes so i can see that a hasn't properly mixed yet and b some of the yeast has risen to the top see you can see a white area a froth forming and d is starting to see some bubbles as well so i can write that on my notes this is our first five minutes so i have stopped the clock and i'm going to write down the first measurement for five minutes so a we have a froth of three millimeters now those buns have just popped off b because the gas has built up so much so here's b 36 so we're measuring from the liquid line so we have a 20 mil froth on b and i'm going to make replace that in there and make sure that the um the bend gets put back on um at every five minute interval i'm also going to make sure by checking the thermometers that the temperature is what i wanted so this is a 30ml froth in c wowie and d my record chart is going to go up i'd say two mil froth in d so now i've got my first set of results i'm going to start the timer again and time another five minutes if we look really closely at sample b and sample c we can see the bubbles being produced and you can see the foam is quite tight in b and quite lively in c now whether this changes the growth lines is something that we will look at at the end so after 10 minutes we're going to have a look at them again so a has gone up to 10 millimeters of foam b is 20 now see the bun has popped off twice and there's bee so i've put on my notes when the buns have popped off because when they do um the froth does drop down but it does show how active they are so they've b and c have had their bunions pop off twice so this this frame has dropped to 20 it was 30 originally and it did get a lot higher in my observations and still with d the higher one i'm gonna say one millimeter there so i'm going to set the timer again for 15 minutes so we're at 15 minutes now so we're gonna repeat the measurements it's been really difficult to get a uh down to as low as four degrees but this is just cold tap water it it is being active and it's at 18 millimeters of foam 30 fat 35 millimeters of foam see the bun popped on c again and the foam reduced so it was a lot higher a minute ago but i have written that on the notes um so this has dropped to 25 mil of foam and d i'm maintaining that there's uh the right temperature on on d by topping it up i'm gonna say one milliliter [Music] millimeter and we're going to restart the clock again so at 20 minutes we're now going to take the fourth measurement now with a it's hard to maintain such a cold temperature it keeps trying to heat up to room temperature the burn has not popped on it it's now 18 so 18 still the same amount from the last measurements b the bun has popped off again which i've recorded and the foam has dropped to 10 and see the foam here is quite open but i'm going to take up to the highest measurement which is 30 of the bubbles and d oh it scares me every time that one so i'm going to reset the clock for one more recording and then we will conclude so for the last recording although i am going to continue the experiment for another couple of minutes a is 25 looks like a slow and steady one b the bone has popped off four times now 32. see the buns is popped off so that was 10 and then d is i'm not even gonna hold it the ruler up it's one for sure so once we have got the data we're going to plot it on the graph paper that you've taken home with you and i mean we're going to use a different color for each of the results