🔍 Key Concepts

• Thermal expansion of liquids inside a closed container • Difference between vapor pressure at saturation and hydrostatic pressure • What happens when a cylinder is filled with too much liquid refrigerant and then warms up

💭 Think About

• When a refrigerant cylinder is overfilled with liquid and the temperature rises, what part of the refrigerant (liquid or vapor) is mainly responsible for the dangerous pressure increase? • Are liquids easily compressed, or do they resist compression when they try to expand in a fixed volume? How does that affect pressure? • Which of the listed pressures depends most directly on temperature change in a tightly filled, closed container?

✅ Before You Answer

• Check which option is directly related to temperature-dependent expansion in a fixed volume • Identify which pressures listed come from equipment (cylinder/compressor) versus a physical property of the refrigerant itself • Verify which concept explains why overfilling is dangerous even if the compressor is off and the valves are closed