The document summarizes an experiment that measured the spray behavior of liquid propane gas (LPG) injected into a constant volume chamber at different back pressures. Key findings include: 1) Spray penetration distance increased over time and was greater at higher injection pressures. Spray angle increased with higher chamber pressure but decreased with greater pressure difference between injection and chamber pressures. 2) Visualization showed the spray to be more finely atomized and penetrating further at higher injection pressures. 3) Correlations were found between non-dimensional pressure difference and spray angle using formulas from previous studies.