By Max Glaskin
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Additional info for Cycling Science: How Rider and Machine Work Together
Aluminum has a low melting point so it is easily welded, and an inert gas is used to shield it from potential contamination by gases in the air. For this process, gas tungsten arc welding (GTAW), also known as tungsten inert gas (TIG) welding, is used. Welding can reduce the strength of aluminum by 80 percent but this weakening can be reversed by heat treating the frame. Titanium especially needs a shield of inert gas to prevent oxygen, nitrogen, and hydrogen from diffusing into the hot alloy and making it brittle.
The separable frame and folding handlebars were released with wing nuts. 64 Strength and Stability o Brompton o Strida (1987) prototype (1975) The simplified steel frame permits an unusually swift folding action that produces an extremely compact portable package. With just three aluminum frame tubes and very small wheels, this folder keeps weight to a minimum. Ride quality and handling are traded for simple and compact folding o Montague Paratrooper (1999) The civilian version of the full-sized stealth folding mountain bike commissioned by the Department of Defense.
A material becomes a gas when the kinetic energy of its molecules (which depends on temperature) is sufficient to overcome the attractive forces between them. What’s more, when you push the piston in the pump, you give some of your own kinetic energy—through the moving piston— to the gas molecules in the pump. Using a simple model of a gas as tiny elastic spheres in random motion, one can show that its temperature is proportional to the average kinetic energy of those molecules: the faster they’re moving, the warmer the gas.