Is there ether?
How many photons are there in ether?
Suppose there is a solid or liquid cuboid between two walls. One wall has a temperature of T1, the other has a temperature of T2. The dendity of photons is number n per cubic meters. The flow rate of the photons inside the cuboid is u meters per second.
Q/S=λ/L*(T1-T2)=(hf1-hf2)*n*u
h*f=3*k*T
then,
(hf1-hf2)*n*u=3k*(T1-T2) *n*u
n=λ/(L*3k*u)
The time to consume the heat flux is:
t=ρ* S*L*Cp(T1-T2)/Q=L^2*Cp*ρ/λ
then,
u=L/t=λ/( Cp*ρ* L)
n= Cp*ρ/(3*k)= Cp*ρ/(4.14*10^(-23))
In general, the Cp*ρ of various substances including ether has the same value of 4*10^6J/(m^3*K).
Thus n=10^29 per cubic meters.
This might be the density of ether.
Because the Cp of ether is 4.7*10^12J/(kgK), the weight density of ether is:
ρ=3*k*n/Cp=4.14*10^(-23)* 10^29 /(4.7*10^12)=10^(-6)kg/m^3
