Aluminum Vs. Steel Conductivity

Aluminum Vs. Steel Conductivity
••• happylemon/iStock/GettyImages

In physics, the term “conductivity” has several meanings. For metals such as aluminum and steel, it generally refers to the transfer of either thermal or electrical energy, which tend to be closely correlated in metals, since the loosely-bound electrons found in metals conduct both heat and electricity.

Thermal Conductivity

Thermal conductivity, the ability of a material to conduct heat, is normally measured in watts per kelvin per meter. (“Watt” is a unit of power, typically defined either as volts times amps or joules of energy per second. The “kelvin” is an absolute unit of temperature, where zero kelvins is absolute zero). Materials with good thermal conductivity transmit large amounts of heat quickly, such as the fast-heating copper bottom of a cooking pot. Poor thermal conductors carry heat slowly, such an an oven mitt.

Electrical Conductivity

Electrical conductivity, the ability of a material to conduct current, is normally measured in siemens per meter. (“Siemens” is a unit of electrical conductance, defined as 1 divided by ohms, where an ohm is a standard unit of electrical resistance). Good electrical conductors are preferred for wiring and connecting. Poor conductors, called insulators, create a safe barrier between live electricity and the environment, such as the vinyl insulation on an extension cord.

Conductivity in Aluminum

Pure aluminum has a thermal conductivity of about 235 watts per kelvin per meter, and an electrical conductivity (at room temperature) of about 38 million siemens per meter. Aluminum alloys can have much lower conductivities, but rarely as low as iron or steel. Heat sinks for electronic parts are made of aluminum due to the metal's good thermal conductivity.

Conductivity in Carbon Steel

Carbon steel has a much lower conductivity than aluminum: a thermal conductivity of about 45 watts per kelvin per meter, and an electrical conductivity (at room temperature) of about 6 million siemens per meter.

Conductivity in Stainless Steel

Stainless steel has a much lower conductivity than carbon steel: a thermal conductivity of about 15 watts per kelvin per meter, and an electrical conductivity (at room temperature) of about 1.4 million siemens per meter.

Related Articles

What Are Insulators?
Aluminum Vs. Copper Conductivity
Raw Materials Used in the Manufacture of Electronic...
Uses for Petroleum Coke
What Are Some Good Conductors?
What Materials Do Magnets Repel?
List Of Conductors
Physical and Chemical Properties for the Element Aluminum
How to Make a Capacitor
Which Would Be the Best Insulator: Diamond, Gold, Lead...
Physical Characteristics of Aluminum Oxide
How to Make a Simple Electric Conductivity Apparatus
Difference Between 316 & 308 Stainless Steel
What Is a Ferrite Clamp?
What Metals Make Good Conductors of Electricity?
Can Aluminum Be Heated & Bent?
The Properties of Insulators
How to Dry Desiccant
How Tantalum Is Mined
How to Build Your Own Paper Foil Capacitor

Dont Go!

We Have More Great Sciencing Articles!