Question

When a razor blade floats on water, then the force of surface tension acts on the circumference of the blade acting tangentially to the liquid surface.
A. True
B. False

Answer 1

Hint: Water is a chemical compound with the formula \[{H_2}O\] . In this formula the ratio of hydrogen and oxygen is \[2:1\] . Water can exist as liquid, solid, gas. When water gets heated it is converted into vapor from liquid and at \[{0^o}C\] water gets converted into ice. The Razor blade is made of steel which is very light in weight.

Complete step by step answer:
The surface tension of water is a very important property. Surface tension is a force acting on the surface of a liquid to shrink into the minimum surface area.
When a razor blade floats on water, there are a total three forces act on the blade thy are,
 The weight of the razor blade which acts to the downwards.
The surface tension of the water acts on the circumference of the blade acting tangentially to the liquid surface.
 The reaction of the water molecules acting upwards.
In these three forces, the upward force is much greater than the downwards forces, which helps the razor blade not to be immersed in the water.
So, the given statement is true.

Hence, option A is correct.

Additional information:
It is observed that water has maximum density \[{4^o}C\] . The maximum density of water is \[1gm/c{m^3}\] at \[{4^o}C\] . When the temperature is either lower or higher than \[{4^o}C\] the density of the water changes from \[1gm/c{m^3}\] and becomes lower. Water is also known as a universal solvent as almost every compound dissolves in water.

Note:
Specific gravity, also known as relative gravity is a dimensionless quantity which is defined as the ratio of the density of a substance to the density of water at a specified pressure and temperature. It is a unitless quantity. Specific Gravity gives information about the weight and density of the object by comparing the weight, mass, and density of the given object with water of the same amount at \[{4^o}C\]