Question

Absolute zero can be defined as the temperature at which:
A.Pressure becomes zero
B.Volume becomes zero
C.Mass becomes zero
D.Density becomes zero

Answer 1

Hint:Absolute zero, temperature at which a thermodynamic system has all-time low energy. It corresponds to $ - {273.15^ \circ }C$ on the Celsius system of measurement and to $ - {459.67^ \circ }F$ on the Fahrenheit temperature scale.
The notion that there's an ultimately lowest temperature was suggested by the behaviour of gases at low pressures: it absolutely was noted that gases seem to contract indefinitely as temperature decreases.

Complete step by step answer:
It appeared that an “ideal gas'' at constant pressure would reach zero volume at what's now called absolutely zero of temperature .Therefore, the perfect gas law is merely an approximation to real gas behaviour. As such, however, it's extremely useful.
The concept of temperature as a limiting temperature has many thermodynamic consequences. for instance, all molecular motion doesn't cease at temperature (molecules vibrate with what's called zero-point energy, but no energy from molecular motion (that is, heat energy) is on the market for transfer to other systems, and it's therefore correct to mention that the energy at temperature is minimal.
At absolute temperature, the pressure of anything becomes close to zero but doesn’t become zero. This is because at that temperature, the molecular activity of matter stops momentarily as the atoms stop vibrating theoretically.
Now talking about the mass of any matter at absolute zero, it is still unknown that what really happens at that temperature, many theories suggest that mass becomes completely zero and yet there are theories which also suggest that mass remains intact.
As we know nothing about the mass of any matter at the absolute zero, it is too difficult to predict what the density of the substance or any matter is at that temperature. So for ease of calculations, the density is considered to be negligible.
So after analyzing each and every option, we come to know that option B is correct, because at absolute temperature if the pressure is kept constant then the volume will be zero too.

Note:
Any scale of measurement having temperature for its numerical quantity is termed as temperature scale or a thermodynamic scale. Within the International System of Units of Units, the Kelvin (K) scale is the standard for all scientific temperature measurements. Its fundamental unit, the kelvin, is identical in size to the Celsius degree and is defined as $1/273.16$ of the “triple point” of pure water $({0.01^ \circ }C$ $[{32.02^ \circ }F]) - $ i.e. the temperature at which the liquid, solid, and gaseous styles of the substance are often maintained simultaneously. The interval between this triple point and temperature comprises $273.16$ Kelvin. The lowest temperature achieved in experiments has been $50$ Pico Kelvin $(pK;$ $1pK$ =${10^{ - 12}}K$) .