What do you mean by absolute zero?

Absolute zero is the coldest possible temperature, at which no heat is left in a substance and its particles display no motion whatsoever. Absolute zero is equal to 0 K on the Kelvin scale, which is equivalent to negative 273.15 degrees Celsius or negative 459.67 degrees Fahrenheit. read more

In other words, while heat may not be removed from a system at absolute zero, it does not represent the lowest possible enthalpy state. In quantum mechanics, absolute zero refers to the lowest internal energy of solid matter in its ground state. read more

Absolute zero is the point at which the fundamental particles of nature have minimal vibrational motion, retaining only quantum mechanical, zero-point energy-induced particle motion. By international agreement, absolute zero is defined as precisely; 0 K on the Kelvin scale, which is a thermodynamic (absolute) temperature scale; and –273.15 degrees Celsius on the Celsius scale. read more

Absolute zero is the coldest possible temperature. More formally, it is the temperature at which entropy reaches its minimum value. The laws of thermodynamics state that absolute zero cannot be reached using only thermodynamic means. read more