Suppose you could suddenly increase the speed of every molecule in a gas by a factor of 2. Would the gas pressure increase by a factor of 2 1/2, 2, or 2^2?

Explanation:

The gas pressure is directly proportional to the mean root square velocity of the constituent molecules of gas .

P ∝      I

Here C₁ , C₂ ------------ Cₙ is the velocities of molecules .

By making these velocities double

The pressure P₀ ∝ 2          II

By dividing II by I

P₀ = 2 P

Thus pressure will become double than its previous value

vapour or gas assuming atmospheriv pressure

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 =