The speed of light in a medium is determined by the refractive index of that medium. The refractive index of a material is a measure of how much slower light travels in that medium compared to its speed in a vacuum. The refractive index of a material depends on factors such as its composition and density.
In general, the speed of light in glass is slower than the speed of light in air at room temperature. Glass has a higher refractive index than air, which means that light travels slower in glass compared to air.
When it comes to thermal conductivity, the speed of light in a material does not directly affect it. Thermal conductivity is a property that describes how well a material can conduct heat. It measures the ability of a material to transfer thermal energy from one point to another.
The thermal conductivity of a material depends on factors such as its molecular structure, density, and specific heat capacity. Generally, materials with higher thermal conductivity can transfer heat more efficiently.
In the case of glass and air, glass typically has higher thermal conductivity compared to air. Glass is a solid material with a dense structure, allowing it to conduct heat relatively well. On the other hand, air is a gas with low density, making it a poor conductor of heat. Therefore, glass has a higher thermal conductivity than air at room temperature.
It's important to note that the speed of light in a material and thermal conductivity are two distinct properties that do not have a direct relationship. The speed of light in a medium is related to its refractive index, while thermal conductivity is related to the material's ability to conduct heat.