Open fractures are defined by a break in the bone that communicates with the outside world through a wound in the skin, often with the bone protruding. That skin breach creates a high risk of infection and contamination, making this description the distinguishing feature from other fractures where the skin remains intact. In contrast, a fracture with intact skin is closed, a spine fracture described as a compression fracture is a specific vertebral injury without an open wound, and a hairline fracture is a tiny crack with little or no displacement and is usually closed. In practice, open fractures require careful sterile dressing over the wound, immobilization of the limb, avoiding pushing the bone back, and rapid medical transport to manage infection risk and systemic complications.

The main idea is to avoid introducing substances to a burn that can interfere with assessment and wound healing. For partial or full thickness burns, the safest first-aid step is to cool the burn with clean running water and protect it from contamination, without applying cooling gels or dressing materials that could trap heat, cause contamination, or conceal the extent of the injury. Saying no cooling gel or burns dressing aligns with that approach, keeping the burn free from ointments or adhesive coverings until proper medical care can be provided. The other options introduce practices that aren’t recommended in this initial management: cooling gels can complicate assessment and may contain ingredients that irritate the wound; applying immediate antibiotic ointment isn’t advised without medical direction and can delay appropriate care; starting with a specific duration of cold-water cooling, especially with very cold water, isn’t a universally endorsed instruction and can carry risks in an aircraft environment.

Air sickness management centers on reducing distress, containing vomitus, and keeping the cabin clean and safe. The best action is to have sick bags readily available and to remove vomitus promptly. Providing a proper bag gives the passenger a discreet, effective way to contain contents, while quick cleanup prevents soiling of seats and surfaces, helps control odor, and reduces exposure risks for others. It also conveys that you’re actively managing the situation, which can be reassuring. Supportive steps that help without making things worse include keeping the passenger seated upright, ensuring good ventilation, and offering small sips of water if tolerated. Forcing fluids can provoke more vomiting or choking. Medications for nausea should only be given with the passenger’s consent or under appropriate medical guidance on board. Moving the passenger to a different seat isn’t a direct treatment for air sickness and doesn’t address the immediate need to contain vomitus and maintain cleanliness.

The main idea is the difference in scope and control between the two kits. An Emergency Medical Kit is designated and much more comprehensive, including prescription medications and advanced equipment for use in serious medical situations; its access is tightly controlled because of the sensitive contents and the need for appropriate medical direction or trained personnel. A standard cabin medical kit, by contrast, provides basic first aid supplies for routine minor incidents and does not include the expanded, prescription-based items or advanced devices. That’s why the described difference—designated and more comprehensive with prescription meds and advanced equipment, with access controlled—best captures how these two kits differ. The other ideas imply they’re the same, that the EMK has fewer items, or that it’s stored in the cockpit, none of which align with how these kits are typically organized and accessed.