How to calculate the rates of increase in mass and in volume for the bag containing sodium chloride solution during the first 30 minutes? ? it’s for my final exam

For first 30 minutes the rate of change of mass  

= M2 – M1/ time taken

= 16 g – 12.5/30

= 0.12 g/min

For first 30 minutes the rate of change of volume  

= V2 – V1/ time taken

= 14 -10 cm3/ 30 min

= 0.13 cm3/ min

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the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.