The combination of high resin content and low density means easy ignition and a lesser burn time. When looking for fast burning wood, it is recommended to find wood that has been dried. If wood is wet, energy from the fire is wasted because it must first evaporate the trapped water then it has to burn. For the most part, if the wood is wet there is more smoke, less flame, and more burning time. Wood that is freshly cut (also referred to as green wood) and is considered young compared to older “seasoned” wood.
Environmental Science Irma Boric Everest University Online Natural gas is a highly flammable gas that is known as a hydrocarbon mixture. Natural gas is contains mostly methane and is the safest form of energy that we can use daily. When animals and buried plants get exposed to heat natural gas is formed. Because natural gas is a cleaner fossil fuel the carbon dioxide emissions are lower. Natural gas also isn’t high in nitrogen oxide or sulfur dioxide.
Pollution is causing the atmosphere to decay and is helping generate global warming. Since there is not much pollution by hydroelectric plants then the earth should be able to last longer. Another main advantage is that water is provided free by nature there is minimum cost to convert it into energy. The earth is made up of 72% of water then there is a main advantage since we have enough water to last a long time. Hydropower plays a major role in reducing greenhouse gas emissions which could also help with less pollution released into the environment.
Plant fibres are known for having great tensile strength and therefore cannot be easily broken by pulling. This, along with their flexibility, makes them very useful. They usually occur in bundles of fibres which are much stronger than the individual cells. Paper is usually made from fibres from wood however wood fibres are not easily extracted because the matrix around the cellulose fibres contains a lot of lignin. As a result, wood is soaked in very strong alkalis such as caustic soda to produce a pulp consisting of cellulose and lignified cellulose fibres in water.
Nuclear energy is a clean and very sustainable source of energy. Australia has the resources and the skills to go nuclear. The debate about Nuclear versus Coal has come and gone as time has gone by. Nuclear energy does not produce green house gases but a little toxic waste. The toxic waste can be managed by treating it well and burying it underground.
It also has high social acceptability as it is cheap, not dangerous and not power plants are in industrial areas away from homes so it has limited NIMBY issues and noise, light and visual pollution. Wind power has medium social acceptability due to its noisiness and ugliness and positioning near residential areas causing NIMBY issues, however it is popular to some as it is a renewable and green energy source, this means it has low environmental impacts. It has medium economic cost as each turbine costs a lot and only produces a little amount of energy, however it is almost free to run after start up costs. Biofuels have high social acceptability, low cost and low environmental impacts because they are
Hemp fiber could be used to make a large variety of papers, which would help decrease the paper industries dependency on wood. Hemp based building materials have proven to be a direct, and even sturdier replacement for wood in construction. With hemp’s many different uses, the saying should go “Hemp is
Gas cleaning refers to the process of removing acid gases, suspended particulates, heavy metals and moisture from the synthesis gas prior to entering the energy recovery system where power, steam and synthetic fuels can be obtained. Unlike waste incineration, plasma gasification WTE technology has proven to have a benign impact on the environment. Daniela.T et al in their work on effect of excess air ratio on syngas produced by gasification of agricultural residues briquettes they noted that the syngas composition and syngas heating value are strongly influenced by the excess air ratio. Concentrations of H2 and CO usually decrease with the increase in excess air ratio, while the concentrations of N2, CO2 and CH4 increase. At a lower excess air ratio, a syngas with a high heating value is
P1 POSSIBLE 6 MARKS QUESTIONS 1. A vacuum flask is designed to reduce the rate of energy transfer by heating process. Describe how the design of a vacuum flask keeps the liquid inside hot? • The plastic cap of the vacuum flask is a good insulator, so it reduces the heat transfer by conduction. It stops convection currents formed at the top of the flask thereby stopping convection.
It maintains Earth’s natural resource and eliminates some of the waste that is buried or burnt. But perhaps the most important advantage of recycling is the amount of energy saved and the decline in greenhouse gases and pollution that result from scrap materials being substituted for virgin materials (The Truth about Recycling. (2007). Economist, 383(8532), 22. Retrieved from EBSCOhost).