Lena Torres
The rumbling and cracking sounds of thunder have been attributed to deities and natural causes throughout history. Today, we know that thunder is the acoustic shock wave that results from the extreme heat generated by a lightning flash. The rapid expansion of the air surrounding the lightning bolt creates a sonic shock wave, often referred to as a thunderclap or peal of thunder. The sound of thunder varies depending on factors such as distance, temperature, and atmospheric conditions.
| Characteristics | Values |
|---|---|
| Scientific name | Acoustic shock wave |
| Caused by | Lightning |
| Lightning temperature | 54,000°F (30,000°C) |
| Nature of sound | Depends on the distance from and nature of lightning |
| Range | From a long, low rumble to a sudden, loud crack |
| Factors affecting the sound | Distance between the observer and the lightning strike, the temperature of the air, the amount of cloud and water in the air, and the position of the lightning channel |
| Sound pressure level | 165 to 180 dB, can exceed 200 dB |
| Audible range | Up to 10 miles (16 km) |
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What You'll Learn
Thunder is caused by lightning
The shock wave in thunder is sufficient to cause property damage and injury to individuals nearby. As shock waves propagate away from the path of the lightning bolt, they are distorted, becoming stretched and elongated. The sound is more muted. Other shock waves from more distant locations arrive at the listener. Shock waves emanating along the lightning bolt's path and arriving at the listener's ear simultaneously enhance the intensity of the sound. The combination of millions of shock waves gives thunder its continuous booming/rumbling sound.
The sound of thunder will vary depending on the distance between the listener and the lightning strike, the temperature of the air, the amount of cloud and water in the air, and the position of the lightning channel relative to the observer. For example, when the lightning channel is roughly parallel to the observer's line of sight, the sound of thunder is a rumble. When the lightning channel is perpendicular to the observer's line of sight, the sound of thunder is a clap.
Thunder can be heard from as far away as 20 km, or as close as 8 km. However, if the air temperature increases with height, sound waves are refracted (bent back toward the Earth) due to their tendency to bend towards areas of lower temperature. Therefore, if you are on the ground, more than 20 km away from a lightning strike, you will not be able to hear it. During a summer day, the air near the Earth's surface can be much hotter than the air above, so the sound waves bend towards the cooler air. Conversely, at night, the air near the surface is likely cooler, so the sound waves bend towards the Earth's surface.
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The sound varies depending on atmospheric conditions
The sound of thunder varies depending on atmospheric conditions. The pitch of thunder lowers as the distance to the lightning strike increases, as the higher frequencies are selectively absorbed. This is comparable to how, when music is playing in another room, you can hear the bass notes but not the high notes.
The temperature of the atmosphere also affects the sound of thunder and how far it travels. Sound waves move faster in warm air than in cool air. Typically, the air temperature decreases with height, and thunder will normally have an audible range of up to 10 miles (16 km). However, when the air temperature increases in height, a phenomenon called an "inversion" occurs, where sound waves are refracted (bent back toward the Earth) due to their tendency to bend or refract toward areas of lower temperature. During a summer day, the air near the Earth's surface can be much hotter than the air above, so the sound waves bend toward the cooler air. Conversely, at night, the air near the surface is likely cooler, so the sound waves bend toward the Earth's surface.
The sound of thunder also depends on the nature of the lightning. If a lightning bolt is forked, the shock waves from the different forks bounce off each other, low-hanging clouds, and nearby hills, creating a series of lower, continuous grumbles of thunder. Vertical lightning is often heard in one long rumble.
The distance between the listener and the lightning strike also affects the sound of thunder. Shock waves from more distant locations arrive at the listener more muted. However, when shock waves from the lightning bolt's path arrive at the listener's ear at the same time, the intensity of the sound is enhanced.
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It can be a clap or a rumble
The sound of thunder is the result of a lightning strike. Lightning can heat the air around it to temperatures of up to 54,000°F (30,000°C), five times hotter than the surface of the Sun. This causes the air to expand explosively, creating a shock wave similar to a sonic boom. This shock wave is what we perceive as the sound of thunder.
The sound of thunder can vary from a clap to a rumble. A clap, or "thunderclap", is a sudden, loud crack or snap. This typically follows a lightning strike that is very close by. A rumble, on the other hand, is a longer, lower sound. This is heard when the lightning channel is roughly parallel to the observer's line of sight, such as when lightning travels from one side of a cloud to another.
The pitch and volume of thunder depend on several factors, including the distance between the observer and the lightning strike, the temperature of the air, the amount of cloud and water vapour in the air, and the position of the lightning channel relative to the observer. For example, sound waves move faster in warm air than in cool air, so thunder tends to be louder and travels further during the summer when the air is warmer.
The sound of thunder can also vary depending on the type of lightning strike. Vertical lightning often produces a long rumble, while forked lightning creates a series of lower, continuous grumbles as the shock waves bounce off each other and surrounding objects. In addition, cloud-to-ground lightning typically consists of multiple strokes, with later strokes having greater acoustic energy and producing louder thunder.
The ancient Greeks and Romans had various theories about the cause of thunder, attributing it to natural causes such as wind striking clouds, the movement of air within clouds, and the sound of hail colliding within clouds. By the mid-19th century, scientists proposed that lightning produced a vacuum and that the collapse of this vacuum resulted in thunder. It is now widely accepted that thunder is caused by the shock wave produced by the rapid thermal expansion of plasma in the lightning channel.
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The speed of sound is slower than light
Thunder is the sound caused by lightning. The speed of sound is slower than the speed of light, which is why we see lightning before we hear its thunder. This phenomenon can be used to gauge the proximity of lightning for safety reasons. The speed of sound in dry air is approximately 343 m/s (1,130 ft/s) or 1,236 km/h (768 mph) at 20 °C (68 °F; 293 K). This translates to approximately 3 s/km (4.8 s/mi).
To estimate the distance of a lightning strike, you can count the seconds between the lightning flash and the subsequent thunder and divide the number of seconds by five for miles or three for kilometers. For example, if the lightning flash is followed by thunder after approximately four seconds, the lightning strike is approximately 1.2 miles or 0.8 kilometers away.
The speed of sound is also slower than the speed at which lightning travels. Lightning bolts can take only a few thousandths of a second to split through the air. The thunder that follows is caused by the rapid expansion of the air surrounding the lightning bolt. As lightning connects to the ground from the clouds, a second stroke of lightning will return from the ground to the clouds, following the same channel as the first strike. The heat from the electricity of this return stroke raises the temperature of the surrounding air to around 27,000 °C (48,632 °F). This rapid increase in temperature creates a rapid increase in air pressure, rising to 10 to 100 times the normal atmospheric pressure. The heated air then explodes outward from the channel, compressing the surrounding air and creating a shock wave, often referred to as a "thunderclap" or "peal of thunder."
The sound of thunder can vary depending on the distance from and nature of the lightning, ranging from a long, low rumble to a sudden, loud crack. The sound of thunder can also be affected by the temperature of the air, with sound waves moving faster in warm air than in cool air. Additionally, the pitch of the thunder lowers as the distance to the lightning strike increases, as the higher frequencies are selectively absorbed.
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Thunder can cause property damage and injury
Thunder is the sound caused by lightning. The extreme heat generated by a lightning flash, which can reach temperatures of 54,000°F (30,000°C), causes the air surrounding its channel to heat up and expand rapidly, creating a shock wave similar to a sonic boom. This shock wave, or "thunderclap", is what we perceive as the sound of thunder.
While thunder itself does not directly damage buildings, the intense pressure wave that accompanies it can cause property damage. The shock wave from a nearby lightning strike can generate an explosive force that shatters windows or cracks walls. This explosive force can also result in internal contusions for individuals in close proximity to the lightning strike, similar to the injuries caused by an explosion. In addition, the loud sound of thunder can lead to eardrum rupture, causing temporary or permanent hearing damage.
To minimize the risk of injury during a thunderstorm, it is important to take precautionary measures. Seek shelter indoors, away from windows, and avoid using corded phones, electrical appliances, wires, and plumbing. These simple steps can significantly reduce the likelihood of injury from lightning strikes or electrical surges. Understanding your insurance coverage is also important, as damage caused by lightning strikes and associated dangers, such as high winds, electrical surges, tree falls, and hail, may be covered by homeowners' policies.
The sound of thunder can provide valuable information about the proximity of lightning. Counting the seconds between the flash of lightning and the subsequent thunderclap can help gauge the distance of the lightning strike. Each second represents approximately 300 meters (984 feet) or 3 seconds per kilometer. A very bright flash of lightning followed by an almost simultaneous crack of thunder indicates that the lightning strike is nearby. Therefore, being aware of the relationship between lightning and thunder can help individuals make informed decisions about seeking appropriate shelter during thunderstorms.
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Frequently asked questions
Thunder is the acoustic shock wave that results from the extreme heat generated by a lightning flash.
How thunder sounds depend on a number of factors: the distance between you and the lightning strike, the temperature of the air, the amount of cloud and water in the air, as well as where the lightning channel is in relation to your position.
Light travels much faster than sound waves. It takes approximately 5 seconds for the sound to travel 1 mile. If the thunder follows the lightning almost instantly, it means the lightning strike was very near.
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