Answer:
- Allergic Responses
- Events Posing Life Threats
Explanation:
Biological hazards can originate from a variety of sources such as bacteria, viruses, insects, plants, birds, animals, and humans. These can lead to numerous health issues, which may range from skin allergies and irritations to infections (like tuberculosis or AIDS) and even cancer.
In the scenario of a metal ingot cooling slowly, the microstructure tends to be coarse. The surface, exposed to higher temperatures for extended periods during cooling, features smaller grain sizes as they have less time to form. However, as we delve deeper into the ingot, the grains gradually extend, leading to equiaxed grain formation at the center.
Answer:
T2 ( final temperature ) = 576.9 K
a) 853.4 kJ/kg
b) 1422.3 kJ / kg
Explanation:
given data:
pressure ( P1 ) = 90 kPa
Temperature ( T1 ) = 30°c + 273 = 303 k
P2 = 450 kPa
To determine final temperature in an Isentropic process
----------- ( 1 )
T2 = 303
= 576.9K
The work performed in a piston-cylinder device is calculated using the subsequent formula
------- ( 2 )
where: cv = 3.1156 kJ/kg.k for helium gas
T2 = 576.9K, T1 = 303 K
substituting values into equation 2
= 853.4 kJ/kg
the work done in a steady flow compressor is determined using this

where: cp ( constant pressure of helium gas ) = 5.1926 kJ/kg.K
T2 = 576.9 k, T1 = 303 K
plugging values back into equation 3
= 1422.3 kJ / kg