Questions

It will stop at a height where the weight of the balloon with contents is equal to the weight of air displaced by it, i.e , when the upthrust is equal to the downthrust. The question of bursting will depend on how much difference of pressure inside and outside , the material of the balloon can withstand. It is assumed the balloon is filled with a lighter than air gas like hydrogen or helium.

The letter 'O'.

The main use of salt in the diet is to produce in small amounts the hydrochloric acid required for the digestion of food.

The sheet number on the map is found in bold print in both the upper right and lower left areas of the margin.

The world's tallest twisted tower, the Infinity Tower was launched in Dubai Marina on 10 June 2013.

Light year is the unit of to express astronomical distances, that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km. More precisely, one light-year is equal to 9,500,000,000,000 kilometers.

Approximately, 1 light year = 10^16 mts.