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What is the thermal conductance of a typical airgaz-metalsolid interface?

I'm trying to numerically compute the macroscopic heat exchange in a simple system: a metal piecesolid body surrounded by airin gas, initially at different temperatures. I, unfortunately, could not find any reference to estimate the thermal conductance at the interface. (Aka, the ratio between the heat exchange and the temperature difference on a unitary area, in Watts per square meters per Kelvin)

I'm only concerned with the diffusive effect, not with any radiative nor convective behavior.

Has anyone got any references for common scenarios? I'm looking for real-world values here. I guess the value at least depends on the metalmaterial of the solid (Aluminium, steelGranite, titaniumWood, etc.), the surface roughness, airthe gas (nitrogen, carbon dioxide, etc.), pressure and so on. Bonus points if anyone's got an idea on how much the heat conductivity varies with the system's parameters (like, how much thermal conductance increases if the airgas pressure doubles.)

EDIT: Made the question not just about metal/air.

What is the thermal conductance of a typical air-metal interface?

I'm trying to numerically compute the heat exchange in a simple system: a metal piece surrounded by air, initially at different temperatures. I, unfortunately, could not find any reference to estimate the thermal conductance at the interface. (Aka, the ratio between the heat exchange and the temperature difference on a unitary area, in Watts per square meters per Kelvin)

I'm only concerned with the diffusive effect, not with any radiative nor convective behavior.

Has anyone got any references for common scenarios? I'm looking for real-world values here. I guess the value at least depends on the metal (Aluminium, steel, titanium, etc.), the surface roughness, air pressure and so on. Bonus points if anyone's got an idea on how much the heat conductivity varies with the system's parameters (like, how much thermal conductance increases if the air pressure doubles.)

What is the thermal conductance of a typical gaz-solid interface?

I'm trying to numerically compute the macroscopic heat exchange in a simple system: a solid body surrounded in gas, initially at different temperatures. I, unfortunately, could not find any reference to estimate the thermal conductance at the interface. (Aka, the ratio between the heat exchange and the temperature difference on a unitary area, in Watts per square meters per Kelvin)

I'm only concerned with the diffusive effect, not with any radiative nor convective behavior.

Has anyone got any references for common scenarios? I'm looking for real-world values here. I guess the value at least depends on the material of the solid (Aluminium, Granite, Wood, etc.), the surface roughness, the gas (nitrogen, carbon dioxide, etc.), pressure and so on. Bonus points if anyone's got an idea on how much the heat conductivity varies with the system's parameters (like, how much thermal conductance increases if the gas pressure doubles.)

EDIT: Made the question not just about metal/air.

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What is the thermal conductance of a typical air-metal interface?

I'm trying to numerically compute the heat exchange in a simple system: a metal piece surrounded by air, initially at different temperatures. I, unfortunately, could not find any reference to estimate the thermal conductance at the interface. (Aka, the ratio between the heat exchange and the temperature difference on a unitary area, in Watts per square meters per Kelvin)

I'm only concerned with the diffusive effect, not with any radiative nor convective behavior.

Has anyone got any references for common scenarios? I'm looking for real-world values here. I guess the value at least depends on the metal (Aluminium, steel, titanium, etc.), the surface roughness, air pressure and so on. Bonus points if anyone's got an idea on how much the heat conductivity varies with the system's parameters (like, how much thermal conductance increases if the air pressure doubles.)