Contextualization and Introduction

Hi everyone. In this project, we are going to delve deep into the concept of Pressure, which is a fundamental topic in Physics and has incredibly practical applications that you may not even be aware of.

Just to give you an idea, pressure comes into play when we breathe, when we use a straw to drink juice, when airplanes fly, and even when we try to predict the weather. Amazing, right?

Before we get into the practical aspects, let's first understand what pressure is. A simple way to describe it is as the amount of force being applied in a certain area. That's why it hurts more when you step on a Lego than when you step on a carpet. Your body's force (your weight) is spread over a much smaller area (the bottom of your foot) when you step on the Lego, and so high pressure results.

Key Theoretical Concepts

The formula defining pressure is P = F/A, where

P is pressure F is force A is area

From this formula, we can gather that pressure is directly proportional to force and inversely proportional to area. So, the greater the force applied or the smaller the area, the greater the pressure will be.

Beyond the concept of pressure itself, we'll also address Atmospheric Pressure. The Earth is covered by a layer of air known as the atmosphere. The weight of this air exerts a pressure on the Earth's surface, which we call atmospheric pressure. Atmospheric pressure can also vary; for instance, it decreases when we increase in altitude.

Connection to the Real World and its Importance

Now that we have an understanding of what pressure is and how it is applied, let's consider its applications in the real world.

Pressure is directly associated with how airplanes manage to fly, how a syringe works, and even why our ears start to feel "stuffed" when we go up a mountain. Atmospheric pressure is also one of the factors that meteorologists consider when predicting the weather.

For that reason, knowledge about pressure is crucial in a variety of professions, like engineers, medical doctors, meteorologists, airplane pilots, and many others. Furthermore, having a grasp of pressure can help us understand natural phenomena and develop increasingly advanced technologies.

Hands-on Activity: Exploring Pressure

Activity Title:

"Making our own Barometer"

Project Goal

The main purpose of this project is to consolidate understanding on atmospheric pressure and its impacts on our daily lives. Students will build a homemade barometer—a tool used to measure atmospheric pressure, record the variations in pressure over a week, analyze the data, and relate it to the observed weather conditions.

Step-by-Step Project Description

Teams of students (3–5 students) will build a homemade barometer and monitor its variations over one week. They will record the changes in atmospheric pressure and the weather conditions daily. With this data, they should try to find correlations between the variations in pressure and the observed weather changes.

The project will span two weeks. The first week will be dedicated to a theoretical study of pressure, building the barometer, and creating the data register format. The second week will be dedicated to monitoring the barometer's variations and recording the weather conditions, followed by data analysis and the writing of a final report.

Necessary Materials

• 1 large-mouth glass bottle
• 1 latex balloon
• 1 barbecue stick
• 1 plastic straw
• Adhesive tape
• Cardboard
• Ruler
• Scissors
• Pencil and paper for data recording

Step-by-Step Guide to the Activity:

1. Cut the latex balloon so that you can stretch it over the mouth of the glass bottle, creating a sealed surface.
2. Secure the balloon to the mouth of the bottle using the adhesive tape.
3. Tape the barbecue stick to the middle of the balloon.
4. Attach the plastic straw to the barbecue stick, adjusting it so that one end of the straw is on the edge of the balloon and the other end extends beyond the barbecue stick.
5. Place the cardboard next to the barometer and use the ruler to mark a reading scale on it.
6. Observe and record the position of the straw on the scale and the weather conditions daily.

Project Deliverables and the Writing of the Final Document

Student teams must submit a final report as a written document, following this structure:

• Introduction: Students should contextualize the theme of pressure, its applications in the real world, the relevance of atmospheric pressure, and describe the objective of this project.
• Development: Students should describe the theoretical concepts of pressure and atmospheric pressure that they studied for this project. Then, they should detail the step-by-step process of building the barometer, the methodology used to monitor the variations and record the data, and present the results obtained throughout the week. They should also discuss the correlations found between atmospheric pressure and the weather conditions.
• Conclusion: In this section, students should state what they've learned, both theoretically and practically, as well as their conclusions on the project. They should also reflect on the importance of teamwork and time management during the project.
• Bibliography: Lastly, students should list the resources they used to carry out their project.

The hands-on activity and the final report aim to consolidate the knowledge acquired, improve students' capacity for teamwork and time management, and also develop analytical and technical writing skills.