The LM35DZ temperature sensor is made for linear measurement in degrees Celsius temperature (or Kelvin).
The sensor is made for measuring temperatures between 0°C and 100°C.
The output voltage is 250mV at 25°C and the sensor has a sensitivity of 10mV/°C.
You can use this information together with the information in the LM35 datasheet, to make a transfer function of the sensor. You may also plot this on your computer or calculator.
The generel equation for the sensor output as a function of the temperature is:
Sensor output [V] = Sensitivity [V/°C] * Temperature [°C] + Output at 0°C (Offset)
Which for the sensitivity listed above and the temperature in is: