Archive of posts by Andrew Hanson
Is black a colour?
Thursday, April 26th, 2012
As a non colour scientist I’d say “What colour’s that black cat there?” to which someone would answer “Black”. So black’s a label as valid as any other colour label.
Scientifically, ‘colourfulness’ scales how colourful something is. Zero colourfulness things include white, grey and black. Though the ‘neutrality’ of whites and greys is rather tricky – often the most neutral thing visible wil be judged as being neutral, so it’s a self calibrating relative white point thing rather than an absolute.
Tags: colour, light, materials, physics
Posted in Originals | No Comments »
How do you build a water rocket?
Thursday, July 8th, 2010
Andrew Hanson, from the National Physical Laboratory, explains how to build you very own water rocket, which is capable of being launched and flown in the air. With some basic, everyday household items and tools you’ll be able to make your own rocket in only an hour or so.
Safety Warning: Before you start, please be aware that water rockets can be a dangerous activity – which requires you to fire a highly pressurised rocket at high speed into the air. Please take the time to act safely, and never fire any rockets towards other people or animals.
Tags: how to, instructional, physics, rockets
Posted in Originals, Videos | 1 Comment »
