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Improper lifting technique is often a primary cause of back strain and injury. A back injury caused by lifting may result in one or more of these problems:

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A nuclear density gauge is a tool used in civil construction. It consists of a radiation source that emits a directed beam of particles and a sensor that counts the received particles that are either reflected by the test material or pass through it. By calculating the percentage of particles that return to the sensor, the gauge can be calibrated to measure the density and inner structure of the test material.

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Petroleum means any liquid hydrocarbon or mixture of hydrocarbons, and any inflammable mixture (liquid, viscous or solid) containing any liquid hydrocarbon.
Classification of petroleum:

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Defensive driving is a set of driving skills that allows you to defend yourself against possible collisions caused by bad drivers, drunk drivers, and poor weather.
Defensive drivers are able to avoid dangers on the road by using their safe driving practices.

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Carbon monoxide (CO) is a deadly, colourless, odourless, poisonous gas. It is produced by the incomplete burning of various fuels, including coal, wood, charcoal, oil, kerosene, propane, and natural gas. Products and equipment powered by internal combustion engines such as portable generators, wagons, lawn mowers, and power washers also produce CO.

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Silicosis is a respiratory disease caused by inhalation of silica dust, which leads to inflammation and scarring of the lung tissue.
Three types of silicosis are seen:

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"Swine flu" refers to influenza in pigs. Occasionally, pigs transmit influenza viruses to people, mainly to hog farmers and veterinarians. Less often, someone infected passes the infection to others.
Causes of swine flu:

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Electricity is a form of energy resulting from the existence of charged particles (such as electrons or protons). It is a form of energy which we use to power machines, electrical & electronic devices. When the charges are not moving, electricity is called static electricity. When the charges are moving they are an electric current, sometimes called dynamic electricity.
Electrical Hazard:

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Ergonomics, Is the study of Designing jobs, equipment, and work tasks to fit human physical characteristics and energy limitations. It considers body dimensions, mobility, and the body’s

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Heat illness is a spectrum of disorders due to environmental heat exposure. It includes minor conditions such as heat exhaustion as well as the more severe condition known as heat stroke.
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