The brick wall (of thermal conductivity
0.41 W/m ·
◦ C) of a building has dimensions
of 5.9 m by 4 m and is 16 cm thick.
How much heat flows through the wall in
a 17.2 h period when the average inside and
outside temperatures are, respectively, 14◦C
and 3◦C?
Answer in units of MJ.

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 =

prndulum needs thread, weight clock to time swings