The end of a glass tube becomes round on heating due to

Assertion A : Sharp glass edge becomes smooth on heating it upto its melting point. Reason R : The viscosity of glass decreases on melting. Choose the most appropriate answer from the options given below.

Why does sharp glass edge become smooth on heating it upto its melting point in a flame ? Explain which property of liquids is responsible for this phenomenon.

Through the two ends of a glass tube of length 200cm hydrogen chloride gas and ammonia are allowed to enter At what distance ammonium chloride will first appear ? .

A glass tube of circular cross section is closed at one end. This end is weighted and the tube floats vertically in water, heavy end down. How far below the water surface is the end of the tube? Given: outer radius of the tube is 0.14 cm , mass of weighted tube is 0.2 g , surface tension of water 73 dyn//cm and g = 980 cms^(-12) .

The lower end of a glass capillary tube is dipped in water. Water rises to a height of 9 cm. The tube is then broken at a height of 5 cm. The height of the water column and angle of contact will be

The lower end of a glass capillary tube is dipped in water. Water rises to a height of 9 cm. The tube is then broken at a height of 5 cm. the height of the water column and angle of contact will be