5
votes
Thermal expansion: why in Celsius and not in Kelvin?
$\Delta T$ is the difference of temperatures - it doesn't matter, whether it is in Celcius or Kelvin, since they differ only by the origin of the scale: $$\Delta T =T_1-T_2=t_1+273.15 - (t_2+273.15)=...
- 55.1k
3
votes
Accepted
A unit of time $\frac{GM}{c^3}$
We first encounter $G$ in Newton's universal gravitation law:
$$F = \frac{Gm_1m_2}{r^2}$$
Applying dimensional analysis,
$$MLT^{-2} = GM^2L^{-2}$$
so $G$ must have units of $M^{-1}L^3T^{-2}$.
A ...
- 10.7k
2
votes
Accepted
Thermal expansion: why in Celsius and not in Kelvin?
No, it is perfectly fine in Kelvins too. You have just mistaken the formula.
Basically, when you see a $\Delta,$ there is very high chance that this is a subtraction of two things.
What the question ...
- 5,131
1
vote
Thermal expansion: why in Celsius and not in Kelvin?
The formula for thermal expansion should include the change in temperature and since a change in temperature by $1^{\circ}\rm C$ is the same as $1\,\rm K$ it matters not which unit of temperature you ...
- 87.2k
1
vote
Thermal expansion: why in Celsius and not in Kelvin?
An object at 0 deg Celsius is at 273.15 Kelvin.
An object at 1 deg Celsius is at 274.15 Kelvin.
If we increase the temperature by 1 deg Celsius we increased it by 1 Kelvin, not by 274.15 Kelvin. ...
- 1,267
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