NEBOSH Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

Liquid Petroleum Gas (LPG) is considered hazardous primarily because it is heavier than air. This property is significant because when LPG is released into the atmosphere, the gas tends to settle and accumulate at lower levels, such as in basements or other confined spaces, where it can pose serious risks, including potential fire hazards and asphyxiation.

Understanding that LPG is heavier than air highlights the need for proper ventilation in areas where it might be used or stored. If LPG leaks, it can create an explosive atmosphere if it reaches an ignition source. Therefore, awareness of its physical properties, such as being heavier than air, is crucial for effective risk assessment and management in occupational health and safety settings.

The other options do not reflect hazardous properties relevant to LPG. Being lighter than air or non-flammable would not present the same risks when it comes to the safe handling and storage of this substance.