define fusion point
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The melting point of a substance is the temperature at which it changes state from solid to liquid. At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depends on pressure and is usually specified at a standard pressure such as 1 atmosphere or 100 kPa.
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here is your answers
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the temperature of melting at which melting takes place most refractory materials how no definite melting point but soften gradually over a range of temperature
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