CONCLUSIONS

INS La Sénia

Tips for conclusions:
Heating plots: boiling point of water and shape of the graphs
Comparision between distilled/tap water, comparision between thermometers
Water boiling point La Sénia vs Gorizia

Workgroup 3 (Mireia, Maria, Dèlia i Marc)

As we can see, all the graphs have a flat section and that’s because there is a change of state, from gas to liquid (boiling).

In our case, the boiling point was 99ºC and it didn’t increase the temperature for a while because the energy was being used to separate particles from each other, during this period the water was both liquid and gas. After the particles are all separated, the temperature starts to increase again.

If we look at the measures of our mates in La Sénia, we can see that everyone had almost the same results as our group. When we measured the boiling point of the water with the mercury thermometer, the results were around 100ºC because we all did it in the same conditions but when we used the sensor the results were incorrect because it didn’t work well.

If we look at measures of our mates in Italy, we can see that there isn’t a big difference from our measures and that’s because there are only 300m of altitude difference from La Sénia to Gorizia. If the difference was bigger, there would be some differences in our measurements.

GROUP 2. PAULA FORCADELL QUEROL, NÚRIA QUEROL CID, CORA VERGE PEÑA I SALMA AMGHAR.

The boiling point of the water is usually 100 ºC. We see that in the graphics are not arriving in 100 ºC but almost. This is a consequence of the thermometers and sensors, because they can not work well or because we approximate the numbers. Also the atmospheric pressure influences in the temperature.

We used two graphics from la Sénia for comparing the differences between the tap water and the distilled water. We can observe that the distilled water achieve the boiling temperature in less time than the tap water. However, it seems that the tap water reaches a higher temperature that the distilled one.

In both cases, we can see that there is a part where the graphic is constant, it means that the change is going on between liquid and gas.

 

In this graphic we don't appreciate the difference between the graphics from La Sénia and the graphics from Gorozia but, if there is any difference is because, as we said before, the atmospheric pressure is different. There is a difference of 300 meters between La Sénia and Gorizia and this makes that the pressure changes. As we can see in the graphics, the pressure in La Sénia is 1010 hPa. However, in Gorizia is about 1024,4 hPa.

Workgroup 1. Alba Roca, Hassna Amaadani, Laura Felipo and Zoé Sabaté

Our boiling point was at 96ºC at 15’5 minutes.

You will have noticed that both your graphs have a flat section. The temperature stays the same for a while. At this temperature both liquid and gas are present. It is the melting point or boiling point of water.

Even though you carry on heating water, its temperature does not go up as the liquid boils. This is because, at its boiling point, the energy is being used to separate its particles from each other.

We compared our graphic to graphic’s workbook number 4.

We observed that the two graphics started to heating at the same time, at the 3 minutes.

After that, our temperature increased to the minute 15. On the other hand, their temperature increased to the minute 18 because they used tap water. This water contained mineral salts and it’s more difficult to boil.

Finally, we can see that our water boiled at 87ºC and the other water boiled at 98ºC.

We observed that the two graphics started to heating at different time, our water at minute 3 and the other at minute 2.

After that, our temperature increased to the minute 15. On the other hand, we can see that the temperature boiled at the same temperature that boiled the water of the workgroup 4, because the two groups used tap water, at minute 18.

Finally, we observed that our water boiled at 87ºC and the other water boiled at 100ºC.


WORKGROUP 4. Albert, Joan and Enric

About the first graphic, we did it with water, the first temperature was 18^oC in the sensor and 15,5^oC in the thermometer. When we heat it we can see that the temperature goes up until it's 99^oC when it stops. That's why in the state changes the water doesn't let the temperature to increase.

If we compare the graphic with normal water with the distilled water, we can see that it's why it hasn't got any impurity and the water boils before, but in the graphic is more difficult to see it because the water doesn't reach the boiling point.

In the Italian’s graphic, the water is at 31 degrees in the beginning and it arrives at 100 degrees, but we can't see it well neither.

 
Workgroup 5. Hamza, Jaume, Joel, Marc Rivas
 

In the graphics we can see how the water goes to the boiling slowly in the first 5 minutes then goes up with the time. Our boiling point measured with the magnetic probe was very low comparing our classmates.

Then comparing the graphics with the tap water we can see the big difference about the water. Watching the thermometers the temperature change little bit but the difference we can appreciate. We didn't arrive to 100 Cº because the thermometer have some failures.

And if we compare our graphics with the mates of Italy the difference with the boiling point wasn't too different because 365 meters weren't different to see the boiling point.

INS Jaume Callís - Vic

ISIS Galilei - Gorizia

Heating plots: boiling point of water and shape of the graphs:

"Hi! I'm Amine. I'm going to discuss about Heating plots in the Water Boiling project, about boiling point of water and about shapes of the graphs. We recorded the water temperature at one or more minutes intervals and we continued until the water was boiling at a constant temperature for at least five minutes. Time (x-axis) vs temperature (y-axis) graphs showed, at a first approximation, that there was a linear relationship between the two variables. The two values, x and y, were directly proportional as they should be for an ideal heating. The graphs shapes were quite linear for graph number two and number three, not for number one in which we could easily find some measurement errors between minute four and minute nine."

Comparision between distilled/tap water, comparision between thermometers:

  "Hi! I'm Federico, I'm going to talk about comparision between thermometers that we used in the water boiling project. We used only distilled water. Initially we observed really small differences between the two thermometers measurements. The differences were more noticeable at high temperature, after sixty Celsius degrees, when the more sensible thermometer T₁ showed a strange little inertia in warming up. The conclusion is that at the boiling point we didn't observe the known one hundred Celsius degrees temperature value by the more sensible thermometer, maybe because it was not correctly calibrated."

Water boiling point La Sénia vs Gorizia: 

Hi! I'm Gianluca. I'm going to speak about water boiling point of La Sènia School school vs Gorizia school. If we compare the Gorizia's water boiling point with the La Sénia results we notice that just in the case of Spanish workgroup number four we find the same value of one hundred Celsius degrees.

Other Spanish groups show a lower value.

But, if we consider the theoretical relationship between water boiling point and altitude, we can undestand why a little decrease for La Sénia is acceptable. In fact if altitude is 365 meters, we can calculate the temperature of 371.80 kelvin corresponding to 98.64 Celsius degrees.