Tag Info

Hot answers tagged

3

This image shows that when a surface is covered by water boundary, the light beams that face the surface, will absorb to it. so there would be less light beams in the area for arriving to our eyes. as a result, we see the material darker.


3

This page seems to give decent coverage of the topic, including this figure: They cite the empirically deduced thermal expansion of austenitic stainless steel to be: $$ \frac{\Delta l}{l} = 10^{-6}(16 + 4.76\times10^{-3}T - 1.243\times10^{-6}T^2)\cdot(T-20) $$ with $T$ having units of degC.


3

Tires are black as most manufacturers add carbon black to rubber to dramatically reduce wear and tear. You can buy colored tires though if you wish.


2

"Soft and squishy" is a bulk property. That's not due to either the polyurethane or the air fraction individually, but of the combination. However, at the scale of a knife's edge, that foam is in fact locally either air or polyurethane. Cutting the air bubbles is trivially easy, but that small fraction of polyurethane is actually quite tough. So, while ...


1

I think the only 'general method' is trial and error. A good catalyst is not expensive is not used up at a high rate (e.g. by poisoning by side reaction) enables high rates of chemical production The physics of how catalysts work is that, of course, they are involved in the chemical reaction. They react with the starting materials and then enable the ...


1

The poster above is incorrect: FCC metals do not have a ductile to brittle transition temperature and instead remain ductile at low temperatures. This is because the stress required to move dislocations is not strongly temperature-dependent in FCC metals, and thus failure occurs by plastic flow instead of crack propagation. In BCC metals, the stress ...


1

This is the line I have been working on, but using Male African Elephants, and Dinosaurs with " n " Elephant Volumes , where the surface gravity of the Earth is inversely proportional to the cube root of the n E.V. ( Elephant Volumes ). n is limited to less than or equal to 13.0 E.V. The number has been getting smaller over the last 252 million years, which ...


1

Perovskites is a huge family of compounds and different compounds have been explored for different properties.Some of the major parameters being surface adsorption,catalytic properties,effect of oxygen percentage on various properties. Perovskites are also widely studied with respect to their production environment as it can affect stoichiometry and thus can ...



Only top voted, non community-wiki answers of a minimum length are eligible