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physics

State of emergency

State of emergency is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand State of emergency rather than just read about it. In short: A state of emergency is a situation in which a government is empowered to put through policies that it would normally not be permitted to do, for the safety and protection of its citizens. A government can declare such a state before, during, or after a natural disaster, civil unrest, armed conflict, medical pandemic or epidemic or other biosecurity risk.

State of emergency — main illustration
State of emergency — illustration

Key takeaways

  • State of emergency belongs to physics; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect State of emergency to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of State of emergency from memory before moving on to harder problems.

Reference excerpt

A state of emergency is a situation in which a government is empowered to put through policies that it would normally not be permitted to do, for the safety and protection of its citizens. A government can declare such a state before, during, or after a natural disaster, civil unrest, armed conflict, medical pandemic or epidemic or other biosecurity risk.

Relationship with international law Under international law, rights and freedoms may be suspended during a state of emergency, depending on the severity of the emergency and a government's policies.

Use and viewpoints Democracies use states of emergency to manage a range of situations from extreme weather events to public order situations. Dictatorial regimes often declare a state of emergency that is prolonged indefinitely for the life of the regime, or for extended periods of time, so that derogations can be used to override human rights of their citizens, usually protected by the International Covenant on Civil and Political Rights (ICCPR). In some situations, martial law is also declared, allowing the military greater authority to act. In other situations, an emergency is not declared, and de facto measures are taken, or the government adopts a decree-law. Nicole Questiaux (France) and Leandro Despouy (Argentina), two consecutive United Nations Special Rapporteurs, have recommended to the international community to adopt the following "principles" to be observed during a state or de facto situation of emergency: Principles of Legality, Proclamation, Notification, Time Limitation, Exceptional Threat, Proportionality, Non-Discrimination, Compatibility, Concordance and Complementarity of the Various Norms of International Law (cf. "Question of Human Rights and State of Emergency", E/CN.4/Sub.2/1997/19, at Chapter II; see also état d'exception). Article 4 to the ICCPR permits states to derogate from certain rights guaranteed by the ICCPR in "time of public emergency". Any measures derogating from obligations under the Covenant, however, must be to only the extent required by the exigencies of the situation, and must be announced by the State Party to the Secretary-General of the United Nations. The European Convention on Human Rights and American Convention on Human Rights have similar derogatory provisions. No derogation is permitted to the International Labour Conventions. Some, such as political theorist and Nazi Party member Carl Schmitt, have argued that the power to decide whether to initiate a state of emergency defines sovereignty itself. In State of Exception (2005), Giorgio Agamben criticized this idea, arguing that the mechanism of the state of emergency deprives certain people of their civil and political rights, producing his interpretation of homo sacer. The state of emergency can be used to overthrow an existing regime's constitution. One example was the August 1991 attempted coup in the Soviet Union (USSR) where the coup leaders invoked a state of emergency; the failure of the coup led to the dissolution of the Soviet Union. Derogations by states having ratified or acceded to binding international agreements such as the ICCPR, the American and European Conventions on Human Rights and the International Labor Conventions are monitored by independent expert committees, regional Courts and other State Parties.

Law in selected countries

Africa

Egypt

States of emergency in Egypt are governed by Law 1958/162. The law grants greater powers to the police, suspends some constitutional rights and legalizes media censorship and state detention of individuals, who may be tried before military courts created under emergency rule. Since the proclamation of the republican system in 1953, Egyptians have lived under four successive periods of emergency rule lasting more than a year: 1956–1964, 1967–1980, 1981–2012 and 2017–2021. The emergency law received widespread criticism during the presidency of Hosni Mubarak, when thousands of civilians were detained under the law according to human rights groups, with estimates of political prisoners running as high as 30,000.

Ethiopia

Article 93 of the Constitution of Ethiopia provides for a six-month state of emergency under certain conditions.

Maldives A state of emergency was declared on 26 December 2004, following the 2004 Indian Ocean Earthquake and Tsunami. The resulting tsunamis caused extensive damage to the country's infrastructure, cutting off communications in large swathes of the nation, decimating islands, and forcing the closure of several resorts. On 5 February 2018, a state of emergency was declared by Maldives's President Abdulla Yameen for 15 days and ordered security forces into the Supreme Court of the Maldives and arrested former president Maumoon Abdul Gayoom and the Chief Justice of the Maldives.

Nigeria In Nigeria, a state of emergency is usually declared during periods of major civil unrest. In recent years, it has specifically been implemented in reaction to terrorist attacks on Nigerians by the Islamic terrorist group Boko Haram. On 14 May 2013, Goodluck Jonathan declared a state of emergency for the entire northeastern states of Borno, Yobe and Adamawa. A more limited state of emergency had been declared on 31 December 2011 in parts of Yobe, Borno, Plateau and Niger states. This earlier declaration included the temporary shutdown of the international borders in those regions. On 26 November 2025, Nigerian President Bola Ahmed Tinubu declared a nationwide security emergency and ordered the military, police, and intelligence agencies to expand recruitment and immediately deploy thousands of additional personnel. He also urged the National Assembly to initiate a process of reforming state police forces to address the escalating wave of kidnappings and terrorist attacks across the country.

Sierra Leone Sierra Leone declared, on 7 February 2019, a State of Emergency due to ongoing rape and sexual violence in the country. On 24 March 2020, a 12-month state of emergency was declared by (Rtd) Brigadier Julius Madaa Bio due to the COVID-19 pandemic.

South Africa

… excerpt ends here. Continue reading the full article.

Illustrations

State of emergency: Members of the Royal Malay Regiment during the Malayan Emergency in 1949, inspecting equipment captured in a raid
Members of the Royal Malay Regiment during the Malayan Emergency in 1949, inspecting equipment captured in a raid
State of emergency: Police stationed in Paris during a state of emergency, November 2015
Police stationed in Paris during a state of emergency, November 2015
State of emergency: Letter from the Portuguese President, Marcelo Rebelo de Sousa, to the Speaker of the Assembly of the Republic, Eduardo Ferro Rodrigues, requesting Parliament for authorisation under the terms of the Constitution, for a declaration of the state of emergency in the context of the 2020 COVID-19 pandemic
Letter from the Portuguese President, Marcelo Rebelo de Sousa, to the Speaker of the Assembly of the Republic, Eduardo Ferro Rodrigues, requesting Parliament for authorisation under the terms of the Constitution, for a declaration of the state of emergency in the context of the 2020 COVID-19 pandemic

Worked examples

Example 1 — a first encounter with State of emergency

Start with the simplest possible case. Write down what State of emergency claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to State of emergency before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about State of emergency ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of State of emergency

In research
State of emergency appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses State of emergency in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
State of emergency is common in secondary-school and first-year university syllabi. It links to neighbouring topics Constitutional law, Dictatorship, Emergency laws, so understanding it makes those chapters shorter.
In everyday life
Look for State of emergency outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study State of emergency in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what State of emergency means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain State of emergency out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is State of emergency in simple terms?

A state of emergency is a situation in which a government is empowered to put through policies that it would normally not be permitted to do, for the safety and protection of its citizens. A government can declare such a state before, during, or after a natural disaster, civil unrest, armed conflic…

Why does State of emergency matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study State of emergency?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on State of emergency.

Tags

  • Constitutional law
  • Dictatorship
  • Emergency laws
  • Emergency management
  • Government
  • Inclement weather management
  • Law enforcement

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