Contextualization
Temperature measurement is something we constantly do, whether to check our body temperature when we feel sick, observe the weather forecast, or even when cooking. However, have you ever stopped to think about how this measurement is possible? How did the concept of temperature arise and why are there different types of scales to measure it?
Temperature is a physical quantity that indicates how hot or cold an object is compared to another. It is a measure of the average kinetic energy of all particles in a system, meaning it is directly related to the agitation of molecules. There are several scales to measure temperature, but the most common ones are Celsius, Fahrenheit, and Kelvin.
Celsius, also known as centigrade, is the scale used in most of the world, including Brazil. It has as fixed points the freezing point of water (0 degrees) and the boiling point of water (100 degrees), both at normal atmospheric pressure. On the other hand, the Fahrenheit scale, used mainly in the United States, has as fixed points the temperature at which a mixture of ice and salt begins to melt (0 degrees) and the temperature at which water starts to boil (212 degrees). Finally, the Kelvin scale, which is used in the scientific field, has as its fixed point absolute zero, that is, the lowest possible temperature in nature (0 K, which is equivalent to -273.15 degrees Celsius). The conversion between these scales is essential for understanding various everyday situations and natural phenomena.
Understanding these concepts is essential not only for Physics but for all sciences, as well as being essential for our daily lives. When we read the weather forecast on an American website, for example, we need to convert the temperature from Fahrenheit to Celsius to truly understand what the temperature will be. Various scientific experiments and industrial processes also require conversion between different scales.
Practical Activity
Activity Title: Temperature Conversion: °C, °F and K - Building a Thermometric Converter
Project Objective
This project aims to understand the theory and practices related to temperature scales, including Celsius, Fahrenheit, and Kelvin. For this, students will build a thermometric converter that will be able to convert any input from one of these scales to the other two.
Detailed Project Description
In this project, groups of 3 to 5 students will first delve into the theory of thermometric scales, understanding their fixed points, origin, and how to perform the conversion between them. This will be done through the study of recommended materials and group discussions.
After the theoretical study, it will be time to get hands-on! Each group must build a thermometric converter using household and/or recyclable materials. This converter should be able to demonstrate how to convert an input from one of the scales to the other two.
Required Materials
- Cardboard
- Ruler
- Colored markers
- Pencil and eraser
- Blunt scissors
Detailed Step-by-Step for Activity Execution
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Each group should start the project with a discussion about the theory of temperature scales and how to convert between them.
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After understanding the theory, students should begin to sketch the design of their thermometric converter. The design should be done in a way that clearly shows the different scales and the conversion between them.
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With the design ready, they should transfer the sketch to the cardboard and cut the necessary pieces.
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Next, they should use the markers to color and mark the different scales on the converter.
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Finally, students should test the thermometric converter using different temperatures to ensure it is working correctly.
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With the converter ready, each group should prepare a presentation explaining how it works and demonstrating its use. The presentation can be done live, in video format, or in writing.
Project Deliverables
At the end of the project, each group must deliver:
- The built thermometric converter.
- A detailed presentation on the operation of the converter, also explaining the theory behind the thermometric scales and their conversions.
In addition to the practical activity, students must submit a report containing:
Introduction
In this section, students should contextualize the theme, explain the relevance of thermometric scales, and the importance of conversion between them. Additionally, they should explain the project's objective and how it will help understand more about the theme.
Development
Students should explain the theory behind thermometric scales and how the conversion between them works. Additionally, they should detail how the project was developed, including a summary of group discussions, the creation of the converter's design, its construction, and the tests performed. They should also present and discuss the results obtained.
Conclusion
Students should conclude the report by summarizing the main points addressed, stating the learnings obtained, and the conclusions drawn. In this section, the group should also reflect on the effectiveness of the created converter and how the project helped understand the theory behind thermometric scales.
Bibliography
Students should list all sources consulted during the project's development, including books, websites, videos, among others.
This project was designed not only to test students' knowledge of thermometer scale changes but also their collaboration, time management, communication, problem-solving, and creative thinking skills.
