The Weir Group plc is an engineering company headquartered in Glasgow, Scotland.

It is listed on the London Stock Exchange and is a constituent of the FTSE 250 Index.

The company operates in over 70 countries employing approximately 14,000 people focused on mining, oil and gas and power markets.

Gas is one of the four fundamental states of matter (the others being solid, liquid, and plasma).

A pure gas may be made up of individual atoms (e.g. a noble gas like neon), elemental molecules made from one type of atom (e.g. oxygen), or compound molecules made from a variety of atoms (e.g. carbon dioxide).

A gas mixture would contain a variety of pure gases much like the air.

What distinguishes a gas from liquids and solids is the vast separation of the individual gas particles.

This separation usually makes a colorless gas invisible to the human observer.

The interaction of gas particles in the presence of electric and gravitational fields are considered negligible as indicated by the constant velocity vectors in the image.

One type of commonly known gas is steam.

Industry is the production of goods or related services within an economy.

The major source of revenue of a group or company is the indicator of its relevant industry.

When a large group has multiple sources of revenue generation, it is considered to be working in different industries.

Manufacturing industry became a key sector of production and labour in European and North American countries during the Industrial Revolution, upsetting previous mercantile and feudal economies.

This came through many successive rapid advances in technology, such as the production of steel and coal.

Engineering is the application of mathematics and scientific, economic, social, and practical knowledge in order to invent, innovate, design, build, maintain, research, and improve structures, machines, tools, systems, components, materials, processes, solutions, and organizations.

Mining is extraction of valuable minerals or other geological materials from the earth usually from an orebody, lode, vein, seam, reef or placer deposits.

These deposits form a mineralized package that is of economic interest to the miner.