Write the title and code of the course.

In the process of manufacturing of infant formulation in the form of powder, $100$ g of

powder separated using a sieve to get fractions as$,10$ g of flour with size $>0\mathrm{.}5mm$;$20g$ of

$<mn>0</mn><mn>.</mn><mn>5</mn><mi>m</mi><mi>m</mi>$;$20g$ of $<mn>0</mn><mn>.</mn><mn>4</mn><mi>m</mi><mi>m</mi>$;$20g$ of of $<mn>0</mn><mn>.</mn><mn>2</mn><mi>m</mi><mi>m</mi>$ and $10$ g on pan. Above

powder occupies $110$ mL of volume. The manufacturer wants to mention USE BY days

after opening the package by the customer. In other words, the package would no longer

behave as a closed system because air can easily enter inside the package due to the

open portion created by the customer. Thus, the package thickness and permeability will

be null. If the initial moisture content of the powder is $4\%($RH $34\%)$ and outside RH is

$88\%$ at $25$ degree celsius, what would be the use by date for the powder once it is

"opened"? Consider $8\%$ moisture content of the powder corresponds to water activity

$(23)$

$0\mathrm{.}7.$