What conditions are needed for an explosion?

What conditions are needed for an explosion?

Prerequisites for an Explosive Atmosphere

• A flammable material in the production process or surroundings.
• Oxygen (air)
• Ignition source.
• A particular ratio between oxygen and flammable material.

What are three characteristics of an explosion?

In general, an explosive has four basic characteristics: (1) It is a chemical compound or mixture ignited by heat, shock, impact, friction, or a combination of these conditions; (2) Upon ignition, it decom- poses rapidly in a detonation; (3) There is a rapid release of heat and large quantities of high-pressure gases …

At what pressure does something explode?

Hydrogen—air mixtures explode quite normally with initial pressures up to 500 atmospheres but at 750 atmospheres detonation occurs with violence sufficient to damage the apparatus. Carbon monoxide—air mixtures have been successfully exploded at initial pressures up to 1,000 atmospheres.

Does pressure affect an explosion?

Direct air-blast effects are damage caused by the high-intensity pressures of the air-blast close in to the explosion and may induce the localized failure of exterior walls, windows, floor systems, columns, and girders. The air blast shock wave is the primary damage mechanism in an explosion.

What conditions exist to create a primary dust explosion?

There are five necessary conditions for a dust explosion:

• A combustible dust.
• The dust is dispersed in the air at a sufficiently high concentration.
• There is an oxidant (typically atmospheric oxygen)
• There is an ignition source.
• The area is confined—a building can be an enclosure.

What is required for a combustible mixture?

The dust must be capable of being suspended in air. The dust must have a particle size capable of spreading the flame. The concentration of the dust suspension must be within the explosible range. An ignition source must be in contact with the dust suspension.

What are some basic elements of an explosive train?

Explosive Train – the steps in which the explosives are aligned to initiate a munition or explosive device;· such as a prime’r, detonator, booster, and main charge. Also called a firing train.

Can explosions happen in space?

In space no one can hear you explode… Many astronomical objects such as novae, supernovae and black hole mergers are known to catastrophically ‘explode’. But as long as the explosion doesn’t require oxygen, then it will work in much the same way in space as on Earth.

How is momentum conservation applied to an explosion?

Momentum Conservation in Explosions. As discussed in a previous part of Lesson 2, total system momentum is conserved for collisions between objects in an isolated system. For collisions occurring in isolated systems, there are no exceptions to this law. This same principle of momentum conservation can be applied to explosions.

How do students change their momenta in an explosion?

Students of varying mass are placed on large carts and deliver impulses to each other’s carts, thus changing their momenta. In some cases, the carts are loaded with equal mass; in other cases they are unequal. In some cases, the students push off each other; in other cases, only one team does the pushing.

What is the definition of a vapor cloud explosion?

Minor editorial changes were made. 2.0 VAPOR CLOUD EXPLOSION THEORY 2.1 Definition A vapor cloud explosion is defined as an explosion occurring outdoors which produces damaging overpressure.

How is the post explosion velocity of a tennis ball calculated?

The variable v is used for the post-explosion velocity of the tennis ball. Using the table, one would state that the sum of the cannon and the tennis ball’s momentum after the explosion must sum to the total system momentum of 0 as listed in the last row of the table. Thus,