Question

Which of the following is a definition of glass transition temperature?

The temperature at which a glass transforms from a solid to liquid.

The temperature at which a glass transforms from a liquid to solid.

The temperature at which there is a slight decrease in the slope of the temperature versus specific volume curve.

Answer 1

The temperature at which a glass transforms from a liquid to solid.

Step-by-step explanation:

Glass transition temperature is defined for polymers, so is the temperature at above which the soft and ductile polymer changes into hard britle material. It basically increases the viscosity of the material. Glass transition temperature is less than the melting point temperature. So, the polymer initially showing liquid like characteristics after transition temperature shows solid like characteristics.

So, the correct answer is

The temperature at which a glass transforms from a liquid to solid.