Final answer:
Compressed gases have an absolute vapor pressure greater than 275 kPa at 50 °C. The subject is Chemistry and it's typically covered in high school.
Step-by-step explanation:
Compressed gases have an absolute vapor pressure greater than 275 kPa at 50 °C. The correct answer is B) 275.
The subject of this question falls under the branch of Chemistry, specifically relating to the properties of gases and their vapor pressures. The grade level appropriate for this type of question is High School, as it involves understanding gas laws and behaviors which are typically covered in high school chemistry curriculums.
Understanding the properties of gases such as vapor pressure is crucial for various applications like calculating partial pressures of gas mixtures, as seen in examples where different gases are combined in a cylinder or for practical applications like deep-sea diving where gas mixtures are crucial for safety.
Compressed gases have an absolute vapor pressure greater than 275 kPa at 50 °C.
Therefore the correct option is B) 275.