What is humidity ? How can be it measured?

What is dry ice ? How can it be converted into gas by changing pressure ?

What is humidity ? Explain it with an activity.

What is blood pressure ? How is it measured ?

What is hypermetropia ? How can it be corrected ?

We know that the density of a cube can be measured by measuring its mass and length of its side. If the maximum errors in the measurement of mass and length are 3% and 2% respectively, what is the maximum error in the measurement of the density of the cube?

What is rancidity ? How can you prevent if ?