March 28, 2024

Sound basics, Propagation of Sound, Velocity of Sound, Measurement of Sound & Properties of Sound

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Sound basics, Propagation of Sound, Velocity of Sound, Measurement of Sound & Properties of Sound


Sound is a fundamental part of our daily lives, influencing everything from how we communicate with each other to how we experience the world around us. Yet, despite its prevalence, the science of sound and how we perceive it remains a topic of curiosity and intrigue for many. This guide aims to demystify sound by exploring its basics, how it travels, its speed, and the QNEX audio visual solutions we can measure it. Let’s dive into the fascinating world of sound, breaking down complex concepts into digestible, engaging pieces of information.

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1. Definition: Understanding the Basics of Sound

Before delving into the complexity of sound, we need to explore the basic principles that govern the presence of sound and our perception of it. As we have experienced, sound is the result of pressure waves and vibrations propagating through various media. By understanding the nature of these waves and our ability to hear, we can gain a deeper understanding of the fascinating world of sound.

1.1 Sound: Propagation of Pressure Waves and Oscillations

At its core, sound is a pressure wave, a form of energy that travels through air, water, and solids. As a pressure wave, sound moves via pressure differences, oscillating between areas of high pressure (compressions) and low pressure (rarefactions). This oscillation is why sound is classified as a longitudinal wave, where the movement of the wave’s particles aligns with the direction of wave propagation. Essentially, when we speak of sound, we’re talking about these vibrations traveling through a medium, be it the air around us or structures like walls and floors.

1.2 Auditory Range of Our Humans

Humans are capable of hearing sounds in the frequency range of 20 Hz to 20 kHz, with variations in sensitivity across different frequencies. Intriguingly, there is a gender difference in voice pitch, with females typically having higher frequency tones compared to males. This higher frequency allows women’s voices to travel longer distances under the same conditions.

2. Propagation: How Sound Travels

The movement of sound waves is a beautiful orchestration of compression and rarefaction, pushing molecules in the air closer together and then pulling them apart. This dance creates pressure differences that propel the wave forward. When observing sound wave propagation, one can notice that the amplitude, or the height of the wave, varies with the pressure changes. Higher amplitudes correspond to areas of compression, where molecules are squeezed together, while lower amplitudes represent rarefaction zones.

The efficient movement of sound waves through spaces depends on this rhythmic alteration in pressure and amplitude, demonstrating sound’s nature as a mechanical wave requiring a medium to travel.

3. The Speed of Sound: Factors Affecting Velocity

One of the more intriguing aspects of sound is its speed. The velocity of sound is directly proportional to the square root of the temperature of the medium through which it is passing. Meaning, in warmer conditions, sound travels faster due to the increased energy in the particles of the medium. For example, at 20 degrees Celsius, the speed of sound in air is approximately 344 meters per second. Understanding how temperature impacts sound velocity is crucial in various fields, including meteorology, aviation, and environmental science.

4. Measuring Sound: Decibels and Their Significance

Sound measurement is a vital aspect of acoustics, enabling us to quantify the intensity of sound waves. The primary unit of sound measurement is the decibel (dB), which can express sound in terms of pressure, power, or intensity. Each measurement approach utilizes logarithmic formulas to compare a given sound level against a standard reference sound pressure level (dB SPL) calculated using 20 log(P/P0), where P is the sound pressure in Pascals, and P0 is the reference pressure. Similar formulas apply to sound power and intensity, making dB a versatile and widely used unit in sound analysis.

5. QNEX Audio-Visual Solutions: Empowering Seamless Communication and Media Distribution

QNEX Audio Visual Solutions is a leading provider of innovative audio-visual solutions, providing cutting-edge technology and seamless integration for a wide range of industries. In addition to the following guidance, you can also explore the advantages of incorporating audio visual communication technologies in corporate environments on our previous blog here.

5.1 Meeting the Evolving Needs of the Times through Technological Advancements

Effective communication and media are vital in today’s extremely rapid digital development. Both private enterprises and group organizations need advanced audio-visual solutions to achieve a seamless audio-visual experience for the audience.

QNEX audio-visual solutions offer a range of cutting-edge capabilities that enable seamless communication and media distribution. With our advanced AV-over-IP technology, users can easily distribute high-quality audio, video, and control signals among multiple devices. Ensure an immersive, engaging experience.

5.2 Optimal Practices for Campus Scenarios: Enhancing Efficiency and Effectiveness

On a university campus, teachers can easily share educational content in classrooms, libraries, and even cafeterias through QNEX’s innovative technology. Students experience enhanced learning effects through seamless audio-visual distribution, resulting in better retention and understanding of information.

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5.3 Customer Feedback and Successful Practices: Enhancing Satisfaction and Performance

Donna, Director of Media Programming, one of our clients, shared her experience with QNEX’s audio-visual solutions and said, “With QNEX, we have changed the programming strategy of media organizations. Seamless content distribution and audience engagement tools take our media platform to the next level. ” From this, it can be seen that choosing the right and professional technology supplier can bring a different and novel journey to an AV technician’s career.


Sound, a phenomenon that pervades every aspect of our lives, is more than just vibrations traveling through a medium. It encompasses a complex system of waves, pressure changes, and energy movements that come together to form the sounds we hear and interact with daily.

By understanding the basics of sound, how it propagates, the factors affecting its velocity, and the methods available for its measurement, we can appreciate the intricate science behind what might seem like a simple sensation.

Whether you’re a music enthusiast, an aspiring audio engineer, or simply a curious mind, the world of QNEX Audio-Visual Solutions offers endless avenues of exploration and discovery.

Here are some other articles that we think might interest you:

What Is Audio Visual Communication?


The Audio Visual Business

What is an AV Technician?

What Does An Audio Visual Technician Do?

Unlocking the Power of Visual Communication

Touring the Audio/Visual Set-Up for a Conference

The Essential Guide to Becoming an AV Technician

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Mastering QNEX Audio-Visual Technology for Church Media Managers

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Unleashing Your Creative and Technical Potential in Arts, AV Technology, and Communications