The main difference between a safety valve and a pressure relief valve is: (a) safety valves are suited for all fluids, whereas pressure relief valves are designed to 4 operate with gases only (b) pressure relief valves are designed to operate with liquids only whereas safety valves can handle all fluids. (c) safety valves are designed for gases only and pressure relief valves will only handle liquids. (d) pressure relief valves are designed to handle gases and safety valves are designed handle only liquids. to

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.

it's c (engineer's do their work with mechanical stuff not on any living being)