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Chemistry / Re: Can an electron have two orbital directions?

« on: 21/02/2019 20:46:55 »

m_l is the closest thing to an "orbit direction"

ie if l = 0 then there is no need to describe a direction
if l = 1 then m_l can be +1 or –1 or 0 (representing each of the axes that the spin could be about)
if l = 2 then m_l can be +2 or +1 or –1 or –2 or 0 (representing each of the pairs axes that the spin could be about) (this one is more of a stretch)

there is no reasonable interpretation of an m_n

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Chemistry / Re: Does the Janet Periodic Table reveal subtle features of atomic structure?

« on: 16/05/2016 22:18:27 »

You can see the Janet version of the periodic table (along with a few other alternatives) at:
https://en.wikipedia.org/wiki/Alternative_periodic_tables#Left_step_periodic_table_.28Janet.2C_1928.29

Richard, can you provide a link to the "four square matrices" version?

Personally, I like Mendeleev's Flower arrangement (scroll down the bottom of this web page).

Radiolab did a podcast on the discovery of the periodic table (17 minutes):
http://www.radiolab.org/story/archives-oliver-sacks-table-elements/

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Physics, Astronomy & Cosmology / Re: What is the speed of gravitational waves?

« on: 18/04/2016 20:37:32 »

Where; V_G⁴ = G (the gravitational constant)

I don't understand how you are balancing the dimensions of this equation

That's because he can't. There is no way that a velocity can be equal to the gravitational constant G. I have done some off the wall equations in my time but that one takes the cake.

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Physics, Astronomy & Cosmology / Re: Are thermal forces defined?

« on: 11/04/2016 22:00:25 »

When you change the temperature of a gas, the pressure (force) also changes.
See: https://en.wikipedia.org/wiki/Combined_gas_law

This effect is very important in the study of thermodynamics and heat engines.
See: https://en.wikipedia.org/wiki/Heat_engine

The same is true for liquids and solids, but the relationships are not so easy to calculate as it is for a gas. So bridges have "expansion joints" to allow for the bridge to safely move as it heats up and cools down on a daily basis.


Thermal radiation can produce a small pressure, due to the momentum of infra-red photons. But this force is so small that it is effectively undetectable on the surface of the Earth, when we are surrounded by air, which forms convection currents near heated objects.

This effect did cause a slight deviation in the path of the Pioneer spacecraft, see: https://en.wikipedia.org/wiki/Pioneer_anomaly

Or are you thinking of some different form of thermal force?