Oxygen is a gas with 8 protons, 8 electrons, and 8 neutrons. The atomic symbol for oxygen is O. Oxygen is located in the chalcogen group of the periodic table. Oxygen's atomic mass is 15.9994 amu. The crystal structure of oxygen is cubic. The melting point of oxygen is 54.750008 K and the boiling point is 90.15 K. The specific heat for oxygen is 0.916. The density of oxygen at room temperature is 0.001429 g/cm3. At room temperature, oxygen is at the gas phase. Oxygen is naturally a diatomic gas...
Solar energy is the generation of energy from sunlight or the conversion of sunlight to electricity. As a renewable source of energy, Solar energy, sunny light and heat from the sun, has been harnessed by humans long time ago using a range of ever-evolving technologies. The heat from the sun (solar radiation), along with other secondary solar-powered resources like wind and wave power, hydroelectricity and biomass, are responsible for most of the available renewable energy on earth...
Those old enough to remember Walt Kelly, are familiar with the declaration of his comic alter-ego, Pogo; a member of the "extreme middle" political movement and environmental advocate. "We have met the enemy, and he is us." American politicians are fond of "declaring war" on societal problems (poverty, drugs, crime, etc.). Indeed, humanity's interaction with the planet has been a sustained attack upon its environment. The Earth, in turn, is offering passive...
In recent year, there has been a growing awareness of environmental issues. As we are the human being that making every decision that will affect global warming, air pollution, and other environmental issues. Our everyday practices in our workplace are among factors that can affect the environmental in more or less ways. Our workplace is the buildings that release more heat and consume more energy that residential building. Are those workplaces really needed to overheat? However it is also a...
Groundwater dependent ecosystems (GDE) usually comprise a diverse structure of surface water bodies and interacting with them groundwater aquifers. Groundwater is invisible source of large variety of surface water: springs originate from groundwater, rivers and lakes exchange their water and solutes in both directions across their beds creating hyporheic exchange, atmospheric precipitation and deposition delivers water and various substances to the surface and groundwater introducing new input...
The article is mainly talk about the interaction between glaciers and climate change. Take the Tianshan No.1 Glacier as an example. Glacier produces in climate and by the impact of climate change. The glaciers change is the result of climate fluctuations. And glacier changes in turn acts on the natural environment that contribute to climate change. Tianshan No.1 Glacier has changed significantly in the past five decades, includes glacier surface firn characteristics, ice formation zones, ice...
An Integrated Assessment and Policy Needs Identification Abstract The study aims to provide in-depth analysis of food security in SSA in a changing climate, by integrating socio-economic factors into scenario analysis. Furthermore, special emphasis will be placed on the regional security issues. The first objective is of the research is to assess the impact of climate change on food security, while the second aim is to identify the key policy needs that should be considered in adaptation...
Electrical power systems include a generating system, a transmission and distribution system and loads. Transmission and distribution system is an important connecting link between the bulk power generating stations and the load canters. The generation plants are normally located in place where the resources are available to generate power economically. The recent trend in power system practice is to locate the generation plants away from the heavily populated areas. The power is then...
Today, the problem of the lack of sources of energy is one of the major threats to the future economic growth and the normal development of the world economy. The use of fossil fuels as the main source of energy leads steadily the world to numerous conflicts because the sources of fossil fuels are limited. The scarcity of fossil fuels stimulates the development of new alternative sources of energy, which are renewable and which can decrease costs of the energy generation. In this respect, the...
What is Recycling ? When you think about the huge amounts of plastics we produce and the problems that can occur when we try to Disposal of plastic, it makes sense to reuse or recycle what we can. Recycling: means making new things from items that have been used and are not need any more. Steps to recycling First, depolymerization is the step of transfer a polymer in a mixture of monomers. Second, thermal depolymerization is a depolymerization step using hydrous pyrolysis for the reduction of...