What is measured with this ??

 This question was asked on Koun Banega Karodpati program.

Question 

What is measured in grams per square meter??

1.  Petrol

2.  Gold

3.  Glass

4.  Paper 

Answer 

 

I know petrol is measured in litres.

Gold is measured in carrots or grams.

So, both petrol and gold can be eliminated.

Remaining are glass and paper.

Grams per square meter or GSM, is commonly used to measure the weight of materials like paper and fabric.

A higher GSM means the material is generally thicker and heavier  !!!!

But when it comes to measure glass, the scale gets shifted from grams to kilograms.

As glass is much denser than paper or fabric.

Correct answer         PAPER      !!!