Reflect on the expansion of water and salt water experiments you and your classmates performed. What are some interesting results and struggles with this experiment.
One of my interesting results from measuring the different heights the water expanded to was that with 1-1/2 tsp's of salt the water expanded more then the cup that had 3 tsp's of salt mixed in the water. It seemed as if the more salt I was going to add to the water the less that it was going to expand when frozen.
I also noticed that it was difficult to measure the different heights that the water's expanded. I did my experiment in clear cups so it was easier to measure the different heights of the frozen water.
Another interesting result I noticed was that it took my cup of water only an hour to completely freeze, while it took my cup with 1-1/2 tsp's of salt about 3 hours, and my 3 tsp's of salt cup took about 4-1/2 hours to freeze.
Relate your thought on this experiment to the scientific question, "is the earth warming?"
"Is the earth warming?" From conducting my experiment with how salt water freezes compared to just tap water, I found that over time temperatures change due to factors that took part in the water, which would be the salt."Just as weather patterns change from day to day, the climate changes too. This occurs naturally, driven by internal and external factors. Through widespread use of land, use of fossil fuels and the building of cities, we have changed our climate." http://www.global-greenhouse-warming.com/climate.html
I was adding a factor to the water which caused the water to take longer to freeze. The more factors we pull into a situation the more "trouble/problems" we may have with the temperatures.
Stated above just shows how with different factors temperature/climate can change. The salt interfered with how fast the water would freeze and just how cold this water would get before it freezes. This is the same for the earth, with cars driving around using fossil fuels and building new cities/buildings also change the temperature and climate on earth. "Temperatures across the globe are most certainly rising; the 1990s was the warmest decade in the last thousand years. Sea surface temperatures have increased 0.4-0.8°C (0.7-1.4°F) since the late 19 Century, and over the period 1961 to 2003, global ocean temperature has risen by 0.10°C (0.18°F) from the surface to a depth of 700 m. The world has warmed 0.74°C in the past hundred years and scientists are clear that the world will get warmer this century due to further increases in greenhouse gas concentrations. Global average temperature is forecast to rise 4°C (7.2°F) toward the end of the 21st century."
No comments:
Post a Comment