(ii) What is the significance of temperature t°С?

This is the temperature scheme that astronomers use to measure the heat in distant objects such as the sun's corona or the gas and dust between stars. There are three temperature scales in common use today: kelvin (K), centigrade or Celsius (C), and Fahrenheit (F).

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.