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Marijose Salinas

on 28 March 2014

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Transcript of Copy of SCIENCE FAIR PROJECT


"Hot liquids"
Ms.Maritza Orozco
Colegio San Patricio

Controlled variables: These are the things that are kept the same throughout your experiments.

Independent variable: The variables that you purposely change and test.

Dependent variable: The measure of change observed because of the independent variable. It is important to decide how you are going to measure the change.

We believe different materials keep liquids hotter for a certain amount of time.

-Coffee Maker
-Cooking Thermometer
-Styrofoam Cup
-Glass Cup
-Ceramic Cup
-Plastic Cup
-Aluminum Cup (metal)
-Thermos Cup
-Starbucks Cup
-Aluminum and Plastic Wrap

Team Members
What types of materials keep liquids
hotter for the longest amount of time?
We think it is important to know which container keeps liquids hotter for the longest amount of time, and that way we could know which would be the best option if we want to maintain our beverage warm.
We decided to use several cups made of different materials such as plastic, metal, ceramic, Styrofoam, and glass to test our project. To test each container, we boiled water and served the same amount of it in each. Then checked every five minutes to see which container held the hottest temperature. We made sure to record each data.
With our results we have concluded that not all the materials have the same insulating and conducting properties, which is an important factor in our test.

We all know that many people in the morning don´t have the time to drink hot liquids such as chocolate, tea, or coffee at home. People must rely on containers to keep their liquids warm for longer periods of time.This is the reason why we decided to do a test several materials and find out which one keeps liquids hotter for the longest amount of time.When you heat liquids, molecules gain energy and move vigorously. These molecules bump into other molecules transferring energy, but there isn´t new energy coming into the system and this is why the liquid begins to cool down.And this is where an insulator comes and helps these molecules continue moving vigorously and as a consequence keep liquids hotter.

We concluded that the cups made of plastic, Starbucks, glass, and ceramic had more insulators than conductors. Metal and Styrofoam cups have more conducting materials than insulating materials that help them maintain the heat for a longer time.

1st Test

1. First, we filled the coffee maker with cold water and waited until it boiled.

2. Then, we measured the hot water's temperature and filled up the same amount of it in Styrofoam, glass, ceramic, metal, plastic, and Starbucks cups.

3. After that we waited 5 minutes, using a timer.

4. Then we registered each container´s temperature.

2nd Test

1. In this 2nd test we did the same procedure as the 1st test, but now we put plastic wrap on top of each container.

3rd Test

And finally, in this 3rd test we followed the exact procedure as the 1st and 2nd tests, but now we placed an aluminum wrap on the top.
Our hypothesis is correct different types of materials keep liquids hotter for a certain amount of time.

The metal container kept liquids hotter than glass, plastic, ceramic, and the Starbucks cups.

To show that different types of containers can keep liquids hotter for different amounts of time.

1st test
We made the experiment without any wrap on top.

2nd Test
We made the experiment with plastic wrap on top.

3rd Test
We made the experiment with aluminum wrap.
Water heating is a thermodynamic process that uses an energy source to heat water above its initial temperature. Typical domestic uses of hot water include cooking, cleaning, bathing, and space heating. In industry, hot water and water heated to steam have many uses.
In a conductor, electric current can flow freely, in an insulator it cannot. Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them.
Most solid materials are classified as insulators because they offer very large resistance to the flow of electric current.
Simply stated, most metals are good electrical conductors, most nonmetals are not.
Temperature of liquids in different containers.
Temperature of liquids in different containers.

Temperature of liquids in different containers.
Marijose Salinas
Carlos Garza
Andrea Lozano
Patricio Ibarra
Vanessa Garza
Full transcript