Yes, meringue does set when exposed to air. When meringue is baked, the proteins in the egg whites denature and form a stable structure, which allows the meringue to set and hold its shape. This process is not reversible, so once the meringue has set, it will remain stable even when exposed to air. However, prolonged exposure to air can cause the meringue to dry out and become brittle. **

When blood is exposed to air, it begins to clot. This process is known as coagulation, where proteins in the blood form a mesh-like structure to stop bleeding. The clotting process is essential for wound healing and preventing excessive blood loss. Additionally, exposure to air can also cause the blood to dry out and form a scab on the surface of the skin. **

When mold is exposed to air on PVC, it can begin to grow and spread if the conditions are right. Mold spores are always present in the air, and when they land on a surface like PVC, they can start to grow if there is enough moisture and organic material for them to feed on. PVC itself does not provide a food source for mold, but if there is any dirt, dust, or other organic matter on the PVC, mold can grow on that. Additionally, if the PVC is in a humid environment, it can provide the moisture necessary for mold growth. Regular cleaning and maintenance can help prevent mold growth on PVC surfaces. **

Yes, ghostwriting can be exposed if the author or the ghostwriter chooses to reveal the true nature of the collaboration. Additionally, if someone involved in the publishing process decides to disclose the ghostwriter's involvement, it can also be exposed. In some cases, similarities in writing style or content between different works may lead to suspicions of ghostwriting, which could ultimately lead to exposure. However, in many cases, ghostwriting agreements include confidentiality clauses, making it difficult to expose the true authorship. **

Exposure to temperatures of 60 degrees Celsius can be harmful to health. At this temperature, the skin can suffer burns within a few seconds of contact, leading to pain, blistering, and potential long-term damage. Prolonged exposure to such high temperatures can also lead to heat-related illnesses such as heat exhaustion or heat stroke, which can be life-threatening if not treated promptly. It is important to avoid prolonged exposure to extreme temperatures and take necessary precautions to protect oneself from heat-related injuries. **

Scammers can be exposed by being vigilant and skeptical of unsolicited communication or offers that seem too good to be true. Researching the individual or company online, checking for reviews or complaints, and verifying their credentials can help uncover any fraudulent activity. Additionally, reporting any suspicious behavior to relevant authorities or consumer protection agencies can help expose scammers and prevent others from falling victim to their schemes. **

The teacher was exposed to the virus when a student in their class tested positive for COVID-19. Despite following safety protocols such as wearing a mask and practicing social distancing, the close proximity to the infected student put the teacher at risk of exposure. The teacher was notified by the school administration and advised to get tested and self-isolate as a precautionary measure. **

The German word "exposed" is "ausgesetzt." **