Watch over a dozen fireworks effects

Explore the chemical compounds found in fireworks

Besides the various salts and metals used to produce fireworks colors, shells are also filled with gunpowder and oxidizers to help fuel and accelerate reactions. Chlorates help strengthen colors, while dextrin, a starch, helps hold mixtures together.

Fireworks' chemical composition and internal layout produce their unique displays

The burning of different metal compounds, facilitated by combining fuel with oxidizers, results in explosions of varying colors. The timing and pattern are engineered through the arrangement of pellets and fuses.

Fireworks make a loud booming sound after explosion due to air expanding faster than the speed of sound

This shockwave is caused by the rapid release of energy and is one of the key characteristics of fireworks, alongside the bright light show. The colors result from chemicals that absorb light at different wavelengths in the spectrum, with higher-energy compounds leading to darker colors and lower-energy compounds—like strontium chloride—producing colors like orange and red.

Fireworks make a loud booming sound after exploding due to air expanding faster than the speed of sound.

Variations in rapidly expanding gas and mechanical elements produce fireworks sounds

Chemical compounds designed to vibrate rapidly when ignited produce whistling, screeching sounds, while crackles and pops are created by small star pellets inside the firework, which explode one after another quickly. Fluttering and chirping sounds are produced by spinning elements that rotate rapidly as the firework ascends.

Watch a drone flight through a fireworks display

This video explores the history, construction, and preparation of modern fireworks displays, including creating gunpowder from scratch. Experimentation with fireworks underwater is also featured, but they require special materials to prevent water from infiltrating the fireworks shell.

Visualize the components of fireworks

This article provides animated diagrams depicting how different parts of fireworks function. The elements work together through timed mechanisms to produce desired effects.

See how fireworks are made and which metals are responsible for different colors

This roughly five-minute video breaks down details about how pyrotechnicians make fireworks, including that magnesium is responsible for white fireworks, copper salts for blue, and charcoal for orange.

See how fireworks are made and learn how metals like magnesium and copper are responsible for different colors.

'Silent' fireworks are not entirely noise-free

By using a reduced amount of flash powder—the ingredient responsible for the loud explosions that fireworks make—"silent" fireworks produce displays between 70 and 90 decibels, rather than the approximately 175 decibels heard in professional displays.

Learn more about the history of fireworks, which date back to an accidental invention during an alchemist's quest for information about immortality

When bamboo in China was tossed into fire in 200 BCE, there was an explosion. About 1000 years later, around 800 CE, an alchemist searching for secrets to immortality mixed sulfur, charcoal, and potassium nitrate together, leading to gunpowder. That mixture was then packed into bamboo or paper tubes, leading to fireworks.

Learn more about the history of fireworks, which dates back to an accidental invention during an alchemist's quest for information about immortality.

Beyond burns, fireworks can harm respiratory, auditory, and visual health

While mishandling fireworks can cause severe burns and loss of appendages, there are also risks for viewers of displays. Released particulate matter can cause the surrounding air to resemble wildfire smoke, and the explosions can cause hearing loss and damage to the corneas.

Watch a pyrotechnician answer questions about fireworks

Professional pyrotechnician Patrick Cyrana answers the internet’s most curious questions about fireworks, from designing ghost effects and exploring how electronic firing systems work to explaining what it takes to create displays in the rain.

Firework-related celebrations include an annual summer celebration in El Salvador, where residents throw kerosene-soaked balls to commemorate a 1658 volcanic eruption

Another memorable tradition takes place in Vrontados, Greece, with people in two rival churches firing bottle rockets at each other's bell towers in an event known as the Rocket War. Yet another tradition occurs in Tainan City, Taiwan, fifteen days into the Chinese lunar calendar, with celebrants donning protective gear and attempting to get hit by fireworks—a tradition dating back to the late 1800s when residents asked the god of war for help with a raging cholera epidemic, with a similar display.

Learn how your body is, scientifically, like a firework with its own slow, controlled burn.

'Silent' fireworks have gained more interest in recent years as a quieter celebratory option.

The most fireworks launched from a pyrotechnics suit is 642

Frenchman Laurent Nat, a pyrotechnics artist and performer with over 10 years of experience, set the world record on June 13, 2014. The suit, inspired by clothes worn by professional firefighters, is made out of 100% cotton and incorporates stilts to allow fireworks to be fired in all directions.

Firework or sparkler burns, even if they cover a relatively small area of skin, can significantly affect our range of motion.

See this overview of the firework rules across all 50 states, ranging from a complete ban on non-professional fireworks in Massachusetts to states with more lax rules like Indiana.

Massachusetts is the only state that bans all non-professional fireworks

See this overview of the firework rules across all 50 states and Washington, D.C. It states that Indiana's rules are relatively loose as compared with other states. Beyond state and local rules on firework purchases and use, there are also regulations about the fuses on fireworks—they must burn between three and nine seconds to help reduce the risk of injury if the user doesn't get away quickly enough.

Shooting stars are streaks of light produced by meteoroids

As these rocks enter Earth's atmosphere at high speeds, friction causes them to burn up, briefly leaving streaks of light. The color of these fireballs can be used to determine the composition of the meteoroid, if it does not reach the ground and become a meteorite for analysis.

The Ruggieri family of pyrotechnicians innovated on European fireworks displays

The Ruggieri family transformed fireworks from military to theatrical displays by focusing on artistry. Claude Ruggieri's knowledge of chemistry allowed him to produce vivid green fireworks, a first in Europe.

Metal fragments can create glowing rings when sand chips them off helicopter blades

The Kopp-Etchells effect—named after two soldiers who died in action in Afghanistan—may occur when kicked-up material shaves off fragments from a helicopter blade's abrasion strip. Due to a property called pyrophoricity, the fragments react with air and ignite, producing halos.

Pellet grills evenly distribute heat across a grill

Using ignited wooden pellets and fans to evenly distribute the heat across the cooking surface, pellet grills give food deep flavor and grant cooks more control, offering a newfangled take on barbecue.

Tiny water droplets can blur a rainbow's colors into a foggy white

When sunlight enters water droplets, it can reflect from the inside and spread out into different colors, producing a series of colorful arcs—supernumerary bows—which we refer to as rainbows. For droplets a few hundredths of a millimeter in size, these arcs overlap onto each other, producing fogbows of white light.

Shooting stars, or meteors, are fragments of asteroids and comets that burn up as they enter Earth's atmosphere, creating streaks in the sky called meteor showers.

Random lasers can be created from biomaterials, such as peanuts and birch leaves

Rather than creating a narrow beam of light via amplification in an optical cavity, the random laser produces a red glow by scattering photons created in the natural pores of a peanut kernel after it has been injected with a solution of light-generating carbon dots derived from birch leaves.

'Special effects' have evolved alongside Hollywood

Since the early days of moviemaking, directors have played with perspective to create incredible effects on the screen. From Buster Keaton to contemporary CGI, this 30-minute documentary details the amazing evolution of Hollywood's special effects.

The best New Year’s Eve drops

There’s more out there than the Times Square ball drop. This list ranks the best of the rest, including the Great Pinecone Drop in Arizona, the Lebanon Bologna Drop in Pennsylvania, and the Pickle Drop in North Carolina.

Simulate the impact of an antimatter bomb around the world

Using "Total Annihilator," users can click on a location on the map, select the antimatter mass, and the observation altitude before detonating the bomb. Scrolling through the left sidebar reveals the impacts of the detonation, including the sizes of the resulting fireball and thermal pulse, the spread of ionizing radiation, and the atmospheric effects.

Explaining why salt should be used to season food early in the cooking process

Experiments involving the same dishes, with salt added at the start of cooking versus at the end, have been shown to yield drastically different taste outcomes because salt takes time to diffuse into foods, particularly vegetables, whose cells are surrounded by cellular membranes and walls. Salting at the end will produce a concentrated surface coating, rather than even seasoning.

Explore a list of 12 recipes incorporating techniques from molecular gastronomy

The recipes include popcorn shooters that taste like liquid caramel corn, almost-instant soft serve made by blending frozen fruit with sugar and fromage blanc, a fusion of fried rice and pizza, and skewered fruit coated in a broiled, glossy meringue.

The Great Salt Lake's distinct dual coloration results from high-salinity organisms that only live in the northern portion and produce a purple protein.

When caught in the mouths of cardinal fish, seed shrimp release glowing, bioluminescent chemicals, which alert predators of the cardinal fish, prompting the shrimp's ejection.

Dirty lightning is a thunderstorm created from friction between rising and falling flows of ash and smoke during volcanic eruptions.

Explore chaos in this simulation of two double pendulums, where small differences in the release angles produce wildly different outcomes.

Power lines are dotted with large, brightly colored balls to improve the visibility of these thin wires to helicopters and small planes and help prevent potential crashes.

In 1984, Operation Smash Hit intentionally crashed a 239-ton train into a nuclear waste canister at 100 miles per hour to prove the canister's safety, which remained completely intact and lost just 0.29 of its 100 pounds of pressure.

For centuries, Niagara Falls has been a magnet for daredevils seeking to conquer one of nature's most powerful wonders, with its 200-foot drop and water rushing at 32 feet per second with 280 tons of force.

All rainbows are 'raincircles' caused by water droplets separating white sunlight into a spectrum of colors, but Earth's surface blocks the bottom half of the circle from our line of sight.

An investigation suggests a Scottish island became awash in forever chemicals via seafoam and seaspray—raising questions about what that means for the safety of other coastal areas.

Massive 3D printers have been used to build homes by stacking layers of 'concrete toothpaste,' a fire-resistant material that effectively insulates against outside noise.

Sony set the standard for cylinder-shaped batteries when it repurposed manufacturing equipment used to make rolls of magnetic recording tape.

Netflix profits when you're not watching, and its movies are designed that way—read a detail-rich critical essay exposing lesser-known Netflix takes

Dorothy's famous entrance into Oz in 'The Wizard of Oz' relied on analog tricks, including a body double and sepia-toned paint, as much as it did on technology

Gerrymandering works through two techniques: cracking opposing voters across districts to dilute their power, and packing them into a few to waste their votes in lopsided majorities.

The power and influence of the American presidency have expanded significantly over time—far beyond what the founders envisioned.

The price of gas is a composite made up of several different factors, with the federal gas tax making up less than 20% of what drivers pay at the pump.

Hear 50 years of iconic hip-hop samples, the genre's foundational looped tracks