The temperature gradient is a vector directed Perpendicular to the normal to the isothermal surface and towards decreasing temperature Parallel to the isothermal surface towards increasing temperature Normally to the isothermal surface towards increasing temperature Normally to the isothermal surface towards decreasing temperature

The temperature gradient is a vector directed:<br /><br />Parallel to the isothermal surface towards increasing temperature.<br /><br />The temperature gradient represents the rate of change of temperature with respect to distance in a given direction. It is a vector quantity, meaning it has both magnitude and direction. The direction of the temperature gradient is parallel to the isothermal surface, which is a surface where the temperature remains constant. The temperature gradient points towards the direction of increasing temperature, indicating the direction in which the temperature is rising the fastest.