Techniquest

The science behind the sparks — how do fireworks work?

Remember, remember the 5th of November.

It’s that time of year between Halloween and Christmas, which means firework displays will be taking over everyone’s Instagram feeds until next week.

Have you ever wondered what goes into the excitement behind fireworks? We’re about to break it down, in case you were wondering.

So, what makes these tiny (sometimes not so tiny) explosions so exciting then? Fireworks are essentially miniature, controlled missiles designed to explode after a short period of burning, accompanied by bright colours and signature sounds. Aerial fireworks – those designed to explode at a great height – consist of 5 essential elements: stick, fuse, charge, effect and head.

A little bit of chemistry is essential…

Chemistry is indeed the magic behind these fiery, artsy creations. A firework is essentially a bunch of chemical reactions happening simultaneously or in an instant sequence. By adding a little heat energy, the solid compound burns with the oxygen in the air to trigger a glorious technicolour spectacle that everybody loves to watch.

However, the main excitement behind chemistry in fireworks comes down to colours. Colours in fireworks are created by different combinations of metal compounds burning in a hot flame, and here are the most common metals used in fireworks:

  • Barium = Green
  • Calcium = Orange
  • Copper = Blue
  • Lithium/Strontium = Red
  • Magnesium = White
  • Sodium = Gold

But don’t forget about physics!

Physics are the second, equally important part of the show. The solid chemicals packed inside fireworks don’t reorganise themselves into other substances, unless the conservation of energy starts the process and decides where the energy comes from and more importantly where it goes.

You guessed it, it is an action-and-reaction time! Also known as Newton’s third law of motion, actions and reactions law are the main reason why fireworks shoot into skies like tiny space rockets.

When a powder packed inside a firework burns out (action), it gives off hot exhaust gases that fire backward, creating an opposite effect (reaction) and forces the firework to go upwards.

Have you also wondered what causes the splendid symmetry of fireworks once they explode? It all has to do with another basic law of physics, the conservation of momentum. The number of components moving in each direction must be identical before and after an explosion, hence the burst of fireworks is always perfectly balanced.

Enjoy the sparklers, hot dogs and endless photo opportunities, and make sure you wrap up warm!

 

Find us

  Techniquest, Stuart Street, Cardiff, CF10 5BW

Contact us

  029 2047 5475
  info@techniquest.org

Opening hours

  During local school holidays
10.00am–5.00pm Bank Holidays, seven days a week.

  School term
9.30am–4.30pm Tuesday–Friday;
10.00am–5.00pm Saturday and Sunday.

Charity & company

  Registered charity no. 517722
  Registered in Wales no. 01955696

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FAQs

  •   What is Techniquest?

    Techniquest is an educational charity, with a science centre in Cardiff Bay. Our mission is to embed science in Welsh culture through interactive engagement. We provide a range of services to schools and teachers to complement formal education provision in Wales and work extensively with public audiences.

  •   Where can I park?

    We are pleased to be able to offer all of our visitors discounted parking with Q-Park, our preferred parking partner.

    The Q-Park operates the Cardiff Bay car park in Pierhead Street which is around 8 minutes walk from Techniquest.

    We have agreed a special discount rate for our customers of 15% off all pre-bookings.
    Pre-book and guarantee your space here using the code TECHNI15.

    There are also nearby pay-and-display car parks on Stuart Street and Havannah Street. Please do not park on Havannah Street itself.

  •   Who is it for?

    Techniquest is suitable for all ages! We do have special events for certain groups, however — see Toddler Days, After Hours and Home Educator days.

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