By Richard Watson
What's going to the area appear like in 2020, 2030 or maybe 2100? How will growth in medical learn have an effect on human lifestyles within the parts of future health and way of life, power and the surroundings, politics and clash, house exploration or even the final word questions of lifestyles? This completely researched and beautifully written e-book bargains an electrifying journey in the course of the wonders -- and terrors -- expecting us over the following hundred years.
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Additional info for 50 Future Ideas You Really Need to Know
Design a material that would minimize damage or at least keep the canopy from breaking into pieces. 1-7 Coiled springs ought to be very strong and sti¤. Silicon nitride (Si3 N4 ) is a strong, sti¤ material. Would you select this material for a spring? Explain. 1-8 Temperature indicators are sometimes produced from a coiled metal strip that uncoils a speciﬁc amount when the temperature increases. How does this work; from what kind of material would the indicator be made; and what are the important properties that the material in the indicator must possess?
SOLUTION The electronic structures and valences are Mg: 1s 2 2s 2 2p6 3s 2 valence electrons ¼ 2 Cl: 1s 2 2s 2 2p6 3s 2 3p5 valence electrons ¼ 7 Each magnesium atom gives up its two valence electrons, becoming a Mg 2þ ion. Each chlorine atom accepts one electron, becoming a ClÀ ion. To satisfy the ionic bonding, there must be twice as many chloride ions as magnesium ions present, and a compound, MgCl 2 , is formed. Solids that exhibit considerable ionic bonding are also often mechanically strong because of the strength of the bonds.
Materials are also attacked by corrosive liquids, leading to premature failure. The engineer faces the challenge of selecting materials or coatings that prevent these reactions and permit operation in extreme environments. In space applications, we may have to consider the e¤ects of the presence of radiation, the presence of atomic oxygen, and the impact from debris. 14 CHAPTER 1 Introduction to Materials Science and Engineering Fatigue In many applications, components must be designed such that the load on the material may not be enough to cause permanent deformation.