Question 1

What is a petapascal?

Accepted Answer

1 PPa = 10¹⁵ Pa = 10 million GPa. Theoretical pressure in stellar cores and neutron stars.

Question 2

Where do petapascal pressures exist?

Accepted Answer

Neutron star cores (10-100 PPa), nuclear explosions briefly, mathematical models of extreme matter.

Question 3

What pressure units do different industries use?

Accepted Answer

PSI in US/UK automotive and HVAC. Bar/kPa in European engineering. mmHg/torr in medicine. Atmospheres in diving and altitude.

Question 4

Is gauge pressure different from absolute pressure?

Accepted Answer

Yes! Gauge pressure reads 0 at atmospheric pressure. Absolute pressure adds atmospheric (~14.7 psi). Vacuum gauge shows negative gauge pressure.

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