Steve Mould

Steve Mould made a video titled "Surely it Breaks The 2nd Law" that examines a physical phenomenon appearing to violate the rule that entropy always increases in a closed system. His channel regularly uses seemingly impossible demonstrations as a hook — posing a provocative scientific question and then using it to reveal how the underlying physics actually works.

Yes — Steve Mould was one of the three founding members of Festival of the Spoken Nerd, the UK-based science comedy live show, alongside mathematician Matt Parker and musician Helen Arney. The touring show helped establish him as a recognizable science communicator well before his YouTube channel reached its current scale.

The liquid hammer is a scientific novelty Steve Mould featured that demonstrates unusual physical behavior in a sealed, liquid-filled tube — and he flagged it as something not available for general purchase. Tracking down rare or one-of-a-kind scientific curiosities is a recurring theme on his channel, making these videos especially compelling for viewers who want to see demonstrations they couldn't easily replicate at home.

Döbereiner's lamp is a 19th-century hydrogen-powered lighter that ignites by using a platinum catalyst to combust hydrogen gas on contact with air — one of the earliest practical applications of catalytic chemistry. Steve Mould covered it as part of his broader interest in obscure but genuinely fascinating historical scientific devices, a recurring theme on his channel alongside modern physics demonstrations.

Some of Steve Mould's short-form content — particularly close-up demonstrations of physical phenomena — naturally overlaps with ASMR, and he tags relevant posts with #asmr. It is not his primary format, but viewers who enjoy immersive, sensory-driven science content often find his hands-on demonstration style satisfying in that way.

Steve Mould is a published science author alongside his video work, with his full book catalog listed at stevemould.com/books. His writing follows the same approach as his videos — making complex or counterintuitive scientific ideas engaging and accessible to a general audience.

Steve Mould has partnered with KiwiCo, Incogni, Planet Wild, Opera, and Henson Shaving for YouTube sponsorships. His lineup skews toward STEM education subscriptions, online privacy tools, and quality everyday products — brands that fit naturally with his scientifically curious, predominantly adult audience.

Yes — Steve Mould runs an active Patreon at patreon.com/stevemould where supporters can fund his science video work directly. He highlights it in his YouTube channel description as one of the primary ways fans can support the channel beyond just watching.

Yes — Steve Mould is based in the United Kingdom, and his science communication style reflects a distinctly British tradition of precise, experiment-led explanation. Despite his UK base, the majority of his audience is in the United States, with a strong secondary following back in the UK.

Steve Mould's YouTube channel has grown to over 3.5 million subscribers, placing him firmly in the Macro tier among science creators. His engagement rate runs well above the category median, which is notable for a channel focused on technical, in-depth science content rather than entertainment-first formats.