| serial | Name | amount of symbols | unit symbol | meaning | 1 | density | ρ | g/cm3 | density is a certain quality of the material per unit volume. | 2 | hot sex than | melting point | ? | ℃ | metal solid-state material change for the melting temperature of the liquid. | Specific Heat Capacity | c | J / (kg · K) | unit mass of a substance, the heat absorbed when the temperature 1 ° C or temperature be reduced by 1 ° C, the heat released. | thermal conductivity | λ | W / (m · K) | per unit time, when the temperature drops 1 ° C per unit length along the heat flow direction, per unit area to allow conduction through the heat. | coefficient of thermal expansion | αL | 10-6 / K | metal temperature is increased by 1 ℃ increase in the length and the ratio of the original length. | 3 | electrical properties | resistivity | ρ | Ω · m | that the conductive properties of the object parameter. It is equal to 1m long, cross-section of 1mm2 wire ends of the resistor. Resistance between the end of the two parallel can also be used a unit cube said. | temperature coefficient of resistance | αp | 1 / ℃ | each lift of the temperature 1 ° C, the resistivity change the amount of the original resistivity ratio, called the temperature coefficient of resistance. | conductivity | k | S / m or% of IACS | the reciprocal of resistivity is called conductivity. Value which is equal to the conductor to maintain the unit potential gradient, the flow of current per unit area. | 4 | magnetic properties | permeability | μ | H / m | is a measure of magnetic materials magnetization of the performance indicators of the degree of difficulty, which is the ratio of magnetic materials in magnetic flux density (B) and magnetic field intensity (H). The magnetic material is usually divided into: soft magnetic material (μ value is very high, up to tens of thousands) and hard magnetic materials (μ value of about 1) the two classes. | magnetic induction | B | T | the magnetization process in magnetic media, can be seen on the original magnetic field intensity (H) coupled with a determined by the magnetization (J), equal to the number of new magnetic 4πJ, and thus the magnetic field B in the magnetic media = H +4 πJ magnetic field, called magnetic induction. | magnetic field strength | H | A / m | by the current in the conductor, the surrounding produces a magnetic field. The size of the magnetic force of the original magnetic moment or current for the characterization of the magnetic field strength. | coercive force | Hc | A / m | sample magnetized to saturation, hysteresis, purports to magnetic flux density is reduced to zero, shall impose a negative magnetic field Hc, Hc is called coercivity. | iron loss | P | W / kg | energy consumption, due to hysteresis and eddy current effect under the conditions of dynamic magnetization of ferromagnetic material. |