Pure citric acid is heat resistant up to a certain temperature. It can withstand moderate heat, but if exposed to high temperatures for an extended period of time, it can degrade and lose its effectiveness. Therefore, it is important to use citric acid within its recommended temperature range to ensure its stability and effectiveness. **

Hydration refers to the process of providing the body with enough fluids to maintain proper function and balance. It involves consuming water and other fluids to prevent the body from becoming dehydrated. Dehydration, on the other hand, occurs when the body loses more fluids than it takes in, leading to an imbalance that can cause symptoms such as thirst, dry mouth, fatigue, and dizziness. In summary, hydration is the act of providing the body with enough fluids, while dehydration is the state of having insufficient fluids in the body. **

No, wood does not start to burn at pure heat. In order for wood to ignite and burn, it needs to reach its ignition temperature, which is typically around 300°C (572°F). This is the temperature at which the wood releases flammable gases that can then ignite and sustain a fire. Pure heat alone is not enough to start a fire in wood. **

180°C convection in top and bottom heat means that the oven is set to 180 degrees Celsius and is using both the top and bottom heating elements to evenly distribute heat throughout the oven. The convection fan helps to circulate the hot air, ensuring that the food cooks more quickly and evenly. This setting is ideal for baking dishes that require even browning and consistent cooking, such as cakes, cookies, and pastries. **

Both pure Germans and pure Celts can have a range of hair colors, including blond and red. While the stereotype of Germans being blond-haired and blue-eyed is common, it is not accurate to say that all pure Germans have these features. Similarly, while red hair is often associated with Celtic heritage, not all pure Celts have red hair. Hair color is determined by a complex combination of genetic factors, and can vary widely within any ethnic group. **

The "180" in Mercedes C 180 refers to the model's engine displacement. In the case of the C 180, it typically indicates a 1.8-liter engine. This naming convention is used by many car manufacturers to give consumers an idea of the engine size and performance level of the vehicle. The higher the number, the larger the engine displacement and potentially higher performance. **

In terms of length, 180 meters can be considered small or large depending on the context. For example, in the context of a football field, 180 meters would be considered long. However, in the context of a building or a city block, 180 meters could be considered relatively small. Ultimately, whether 180 meters is considered small or not depends on what it is being compared to. **

180 is a relatively large number. It falls between 100 and 200 on the number line, making it closer to 200. In terms of quantity, 180 can represent a significant amount of something, depending on the context. For example, 180 days is equivalent to 6 months, which is a substantial portion of a year. **