Is gunpowder a low explosive?

Yes, black powder (gunpowder) is the classic example of a low explosive. It deflagrates to produce propulsive gases.

Can a low explosive be dangerous?

Absolutely. While they don't detonate, low explosives can cause violent explosions if confined. They are responsible for many accidental explosions in history.

What's the main difference between a low and high explosive?

The reaction speed and resulting pressure wave. Low explosives deflagrate (burn below the speed of sound). High explosives detonate (react supersonically, creating a shockwave).

Would TNT be considered a low explosive?

No. TNT (trinitrotoluene) is a prime example of a high explosive. It detonates with a supersonic shockwave, causing a shattering effect.

low explosive

UK/ˌləʊ ɪkˈspləʊsɪv/US/ˌloʊ ɪkˈsploʊsɪv/

Technical / Specialized

My Flashcards

Definition

Meaning

An explosive material that deflagrates (burns rapidly) rather than detonates, producing a subsonic explosion.

A class of explosives used primarily for propellant purposes (e.g., in firearms, fireworks) or in applications requiring a pushing or heaving force rather than a shattering effect.

Linguistics

Semantic Notes

The term is defined in contrast to 'high explosive'. It refers to the chemical's reaction speed and the type of pressure wave produced. It is a technical classification, not a description of power or danger.

Dialectal Variation

British vs American Usage

Differences

No significant lexical differences. The technical definition is identical in both varieties.

Connotations

Neutral technical term in both. May carry connotations of controlled, propulsive force (e.g., gunpowder) rather than destructive blast.

Frequency

Extremely low frequency in general discourse. Used almost exclusively in military, mining, pyrotechnics, and forensic contexts.

Vocabulary

Collocations

strong

black powder is a low explosiveclassify as a low explosivepropellant low explosive

medium

typical low explosivecommon low explosiveuse a low explosive

weak

certain low explosivepowerful low explosiveold low explosive

Grammar

Valency Patterns

[low explosive] + [verb: deflagrates, burns, propels][subject] + [is/classed as] + a low explosive

Vocabulary

Synonyms

Strong

gunpowder (as a common example)black powder

Neutral

propellant explosivedeflagrating explosive

Weak

slow-burning explosivepushing explosive

Vocabulary

Antonyms

high explosivedetonating explosive

Phrases

Idioms & Phrases

“[No common idioms for this technical term]”

Usage

Context Usage

Business

Rare. Possibly in contexts of manufacturing, logistics, or insurance for pyrotechnics or propellants.

Academic

Used in chemistry, materials science, forensic science, and engineering texts discussing explosive classification.

Everyday

Virtually never used. A layperson would simply say 'gunpowder' or 'firework powder'.

Technical

Primary domain. Used in military, demolition, mining, pyrotechnics, and ballistic research to specify reaction type.

Examples

By Part of Speech

verb

British English

The mixture is designed to low-explosive deflagrate rather than detonate.
The material will low-explosive burn if confined.

American English

The compound is engineered to low-explosive deflagrate under pressure.
It will low-explosive combust rather than explode.

adverb

British English

[No standard adverbial use for this noun compound]

American English

[No standard adverbial use for this noun compound]

adjective

British English

They conducted tests on low-explosive materials.
The low-explosive compound was used as a propellant.

American English

The ATF has specific regulations for low-explosive substances.
They recovered low-explosive residue at the scene.

Examples

By CEFR Level

Gunpowder is a low explosive.
Fireworks often use low explosives.

A low explosive burns quickly to push things, not break them.
Black powder, a common low explosive, is used in some bullets.

Forensic scientists can distinguish residue from a low explosive and a high explosive.
The safety protocols differ significantly for storing low explosives.

The deflagration characteristic of a low explosive produces a subsonic pressure wave, making it suitable for propellant applications in internal ballistics.
Legislation categorises pyrotechnic compositions containing potassium nitrate as low explosives due to their burning rate.

Learning

Memory Aids

Mnemonic

Think 'LOW speed, LOW sound' – low explosives burn fast (deflagrate) but below the speed of sound.

Conceptual Metaphor

A SHOVEL vs. a HAMMER. A low explosive is like a shovel that pushes/heaves material; a high explosive is like a hammer that shatters it.

Watch out

Common Pitfalls

Translation Traps (for Russian speakers)

Avoid direct calque 'низкий взрывчатый'. The correct technical term is 'метательное взрывчатое вещество' or 'порох' for the common example.
Do not confuse with 'low-yield' (малой мощности), which refers to total energy, not reaction type.

Common Mistakes

Using 'low explosive' to mean 'weak explosive'. Strength is not the defining characteristic.
Confusing it with 'high explosive' in technical descriptions.
Using it in everyday conversation where 'gunpowder' or 'firework charge' is meant.

Practice

Quiz

Fill in the gap

Unlike a high explosive which detonates, a burns rapidly in a process called deflagration.

Multiple Choice

What is the primary use of a low explosive?

FAQ

Frequently Asked Questions

: Yes, black powder (gunpowder) is the classic example of a low explosive. It deflagrates to produce propulsive gases.
: Absolutely. While they don't detonate, low explosives can cause violent explosions if confined. They are responsible for many accidental explosions in history.
: The reaction speed and resulting pressure wave. Low explosives deflagrate (burn below the speed of sound). High explosives detonate (react supersonically, creating a shockwave).
: No. TNT (trinitrotoluene) is a prime example of a high explosive. It detonates with a supersonic shockwave, causing a shattering effect.