One metal. Two kinds of transport.

Charge and energy are different questions

Electrical conductivity describes how readily a material carries electric current under an electric field. Thermal conductivity describes how readily it transfers heat along a temperature gradient. Silver is an excellent conductor in both senses. That connection has a physical basis: mobile electrons in a metal can carry charge and transport thermal energy. Nevertheless, electrical current and heat flow are different quantities. A specification for one cannot simply be substituted for the other.

Read the units before the comparison

Electrical conductivity is commonly expressed in siemens per metre, while thermal conductivity is expressed in watts per metre per kelvin. Comparing their numerical values directly would make no sense. Their test conditions matter too: a value for a pure bulk metal at a stated temperature is not automatically the value of an alloy, a thin coating or a finished component. Always compare the same property under sufficiently similar conditions.

The component is more than the material

A material property does not, by itself, give the resistance of a wire or the heat flow through a part. Length, cross-sectional area and the relevant driving difference enter those calculations. Interfaces and connections can also limit the performance of an assembly. A silver surface may improve one part of a design without removing another bottleneck. Conducting heat efficiently redistributes thermal energy; it does not make that energy disappear.

Optimise the whole design

The strongest property on a table is not necessarily the best commercial choice. Engineers also weigh cost, mechanical requirements, manufacturability and the conditions in which a component will operate. Silver’s use in electrical contacts illustrates how a small amount can serve a specific function. The useful question is therefore not simply which metal conducts most readily, but where that conductivity improves the complete product enough to justify the material and design choices.

FOLLOW THE EVIDENCE

Sources & further reading

Sources checked 14 November 2026. Reference organisations do not endorse this website. Price examples are hypothetical and educational.