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Further, one may define the emissivity ε ν,X (T X) of the material of the body X just so that at thermodynamic equilibrium at temperature T X = T, one has I ν,X (T X) = I ν,X (T) = ε ν,X (T) B ν (T). When thermal equilibrium prevails at temperature T = T X = T Y, the rate of accumulation of energy vanishes so that q(ν,T X,T Y) = 0.
A study on the vertebral column of Annakacygna hajimei is published by Matsuoka, Seoka & Hasegawa (2024), who reconstruct the neck of this bird with a curve at its base that increased the buoyancy and stability of the bird's body when it was in the water by helping it to put the base of the neck with its air sacs below the water surface. [268]