The count of nuclear-armed states is generally accepted to include the five original nuclear-weapon states (USA, Russia, UK, France, China) plus India, Pakistan, North Korea, and Israel, which maintains a policy of nuclear ambiguity. This brings the total number of states possessing nuclear capabilities to nine.

Boiling point elevation is a colligative property that depends on the number of solute particles in a solution. CaCl2 dissociates into three ions (one calcium and two chloride ions) per formula unit, which is more than NaCl (two ions) or non-electrolytes like sucrose and glucose. Therefore, the 1% CaCl2 solution produces the highest concentration of particles, resulting in the greatest boiling point elevation.

Following the 1995 NPT Review and Extension Conference, France announced a series of nuclear tests in the South Pacific. These tests were controversial and occurred in the mid-1990s, shortly after the indefinite extension of the treaty was confirmed by the international community.

North Korea officially announced that it had conducted its first underground nuclear test on October 9, 2006. This event took place at the Punggye-ri nuclear test site and was detected by international seismic monitoring stations. The test marked a significant escalation in regional geopolitical tensions and prompted international concern regarding nuclear proliferation in the Korean Peninsula.

In October 1952, the United Kingdom conducted its first nuclear weapons test, codenamed Operation Hurricane. The test took place at the Monte Bello Islands, located off the northwest coast of Western Australia. This event marked the beginning of the British nuclear testing program in Australia, which was conducted in collaboration with the Australian government during the early years of the Cold War era.

The Soviet Union achieved a major milestone in nuclear development on August 29, 1949, when it successfully detonated its first atomic device, known as RDS-1 or 'First Lightning'. This event marked the end of the United States' monopoly on nuclear weapons and significantly escalated the geopolitical tensions of the Cold War era, leading to a rapid expansion of nuclear capabilities globally.

On February 13, 1960, France successfully detonated its first atomic bomb, codenamed 'Gerboise Bleue', in the Reggane region of the Algerian Sahara. This event marked France's entry into the group of nations possessing nuclear weapons. The test was part of a broader French nuclear development program that took place during the colonial era in Algeria.

Following the resumption of nuclear testing in the South Pacific, France conducted a series of tests in the mid-1990s. The final test of this specific series, which drew significant international attention and protest, was conducted on January 27, 1996. This marked the conclusion of France's nuclear testing program in the Pacific region before they signed the Comprehensive Nuclear-Test-Ban Treaty.

In 1957, Britain conducted a series of nuclear tests known as Operation Grapple near Christmas Island in the Pacific Ocean (often associated with the Indian Ocean region in historical context). These tests were successful in demonstrating Britain's capability to develop and detonate a hydrogen bomb, establishing it as a nuclear power.

The Pokhran-II tests, collectively known as Operation Shakti, were a series of five nuclear bomb test explosions conducted by India. The first three tests were conducted on May 11, 1998, and two additional tests were conducted on May 13, 1998. These tests were a significant milestone in India's nuclear program, demonstrating the country's technological capabilities and strategic autonomy on the global stage.