. Refrigerant-134a enters the coils of the evaporator of a refrigeration system as a saturated liquid– vapor mixture at a pressure of 160 kPa. The refrigerant absorbs 180 kJ of heat from the cooled
space, which is maintained at -5°C, and leaves as saturated vapor at the same pressure. Determine
(a) the entropy change of the refrigerant, (b) the entropy change of the cooled space, and (c) the
total entropy change for this process.

report!

explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =