Editing Talk:2205: Types of Approximation
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The cosmologist is probably using Fermi's a la [https://what-if.xkcd.com/84/ What-If 84: Paint the Earth][[User:OhFFS|OhFFS]] ([[User talk:OhFFS|talk]]) 20:34, 20 September 2019 (UTC) | The cosmologist is probably using Fermi's a la [https://what-if.xkcd.com/84/ What-If 84: Paint the Earth][[User:OhFFS|OhFFS]] ([[User talk:OhFFS|talk]]) 20:34, 20 September 2019 (UTC) | ||
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As a physics Phd (though not working in astrophysics), approximating pi to 1 is not all that bad. Especially when the measurable quantities that go into the calculation usually have huge error bars.--[[Special:Contributions/172.68.59.120|172.68.59.120]] 21:03, 20 September 2019 (UTC) | As a physics Phd (though not working in astrophysics), approximating pi to 1 is not all that bad. Especially when the measurable quantities that go into the calculation usually have huge error bars.--[[Special:Contributions/172.68.59.120|172.68.59.120]] 21:03, 20 September 2019 (UTC) | ||
Using natural units (setting c=hbar=1) is different from setting pi to 1. Using different units is always allowed and not an approximation. Setting pi to 1 on the other hand, is an approximation and is only justifiable if the other quantities in the calculation have huge uncertainty. --[[Special:Contributions/172.68.59.120|172.68.59.120]] 21:07, 20 September 2019 (UTC) | Using natural units (setting c=hbar=1) is different from setting pi to 1. Using different units is always allowed and not an approximation. Setting pi to 1 on the other hand, is an approximation and is only justifiable if the other quantities in the calculation have huge uncertainty. --[[Special:Contributions/172.68.59.120|172.68.59.120]] 21:07, 20 September 2019 (UTC) |