# Relationship Between Sound And Air Pressure

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Contents

## Introduction

In the experiment, we will determine the relationship between sound and air pressure. Our hypothesis is that as the air pressure decreases, the sound also decreases at a faster rate.

## Aim

To find the relationship between air pressure and sound.

## Theory

1. Numerous factors affect the speed of the sound, some of which are density, the humidity of the medium, and temperature.

2. It is directly proportional to the temperature and humidity and inversely proportional to the density of the medium.

## Requirements

1. A Ringing Bell

4. Notebook A Vacuum Gauge

## Procedure

Step 1: Inside the vacuum chamber, place a ringing bell and a digital sound level meter.

Step 2: Increase the vacuum gauge by five inches of mercury of vacuum at a time.

Step 3: Repeat this cycle, and in every cycle, increase the vacuum gauge by five inches of mercury.

Step 4: Record the inches of mercury of a vacuum with the corresponding decibel number of the sound meter.

Step 5: Do five tests, and record your observations.

## Observation

1. We observed that the decibel of the sound meter is inversely related to the inches of mercury in the vacuum. This means, on increasing air pressure, the sound level quickly increases.

2. Decibel decreases at an exponential or not linear rate.

3. Every time we increase the five inches of mercury in a vacuum, the decibel decreases with a greater amount.

## Result

For each of the tests, as the air pressure increased, the decibel constantly decreased.

## Precautions

1. In every cycle, the vacuum gauge increases by five inches of mercury.

2. Sound meter should be working properly.

## Conclusion

In this experiment, we found a relationship between sound and air pressure.

Q.1 What was the aim of your experiment?

ANS. Our aim was to find a relationship between air pressure and sound.

ANS. Our hypothesis was that, on increasing air pressure, sound increases at a faster rate.

Q.3 What was the relationship between the decibel of the sound meter and the mercury of the vacuum?

ANS. The decibel of the sound meter is inversely related to the inches of mercury in the vacuum.

Q.4 How does the decibel decrease in your experiment?

ANS. Decibel decreases at an exponential or not linear rate.

Q.5 How does the humidity of the medium affect the speed of sound?

ANS. The humidity of the medium is directly proportional to the speed of sound, which means the greater the humidity of the medium, the more the sound will be.