No, ember is not hotter than fire. Ember is the glowing remains of a fire that has started to die down, whereas fire is the active, burning flames produced by a combustion reaction. Fire typically burns at a higher temperature than ember, as it is actively consuming fuel and releasing heat and light. **

Heat and cold are not inherently "stronger" than each other, as they are simply different manifestations of temperature. However, in terms of their effects on the human body, extreme heat can be more immediately dangerous than extreme cold. Prolonged exposure to extreme heat can lead to heat stroke and other heat-related illnesses, whereas extreme cold can lead to hypothermia. Therefore, in terms of their potential impact on human health, extreme heat can be considered more immediately dangerous than extreme cold. **

The roaring blue flame is hotter than the bright yellow-orange flame because it has more complete combustion. The blue flame indicates that the fuel is burning efficiently and at a high temperature, resulting in a hotter flame. In contrast, the yellow-orange flame is often a sign of incomplete combustion, which means that not all of the fuel is being burned, resulting in a lower temperature flame. Therefore, the roaring blue flame is hotter due to its more efficient and complete combustion process. **

No, you can only get one flame per day. The flame represents the completion of your daily goal, and it resets at the end of each day. It's a way to encourage consistency and regular practice. If you want to earn more flames, you'll need to continue completing your daily goal each day. **

Dry heat is generally more tolerable than humid heat because our bodies rely on the evaporation of sweat to cool down. In dry heat, sweat evaporates quickly, allowing our bodies to cool efficiently. However, in humid heat, the air is already saturated with moisture, making it harder for sweat to evaporate. This can lead to a feeling of stickiness and discomfort, as our bodies struggle to regulate temperature effectively. **

No, helium does not heat up more than air. In fact, helium has lower heat capacity than air, which means it requires less energy to raise its temperature. This is why helium is often used in balloons for celebrations, as it allows the balloon to float due to its lower density, and it does not heat up as much as air when exposed to sunlight. **

A line spectrum is more accurate than a flame test because it provides a more detailed and precise representation of the elements present in a sample. A line spectrum shows the specific wavelengths of light emitted or absorbed by the atoms of an element, allowing for the identification of individual elements based on their unique spectral lines. In contrast, a flame test only provides a general color observation, which can be influenced by various factors such as the temperature of the flame and the presence of other elements. Therefore, a line spectrum is a more reliable and accurate method for identifying elements in a sample. **

Metal conducts heat better than plastic because of its atomic structure. Metals have a crystalline structure with free-moving electrons that can easily transfer thermal energy. In contrast, plastics have a more amorphous structure with tightly bound atoms, which hinders the transfer of heat. This difference in atomic arrangement allows metals to efficiently conduct heat, making them better thermal conductors than plastics. **