Yes, butane is lighter than air. Butane is a gas that is less dense than air, which means it will rise and disperse in the atmosphere. This property makes butane highly flammable and a common choice for use in lighters. **

Butane itself is not deadly in small amounts, as it is commonly used as a fuel in lighters. However, inhaling large amounts of butane gas can be harmful and even fatal. Inhaling butane can cause dizziness, nausea, vomiting, asphyxiation, and in severe cases, can lead to cardiac arrest. It is important to use lighters in a well-ventilated area and avoid inhaling the gas directly. **

Yes, butane gas is lighter than air. Butane has a density of 2.48 kg/m³, while air has a density of 1.225 kg/m³. This means that butane gas will rise and disperse in the air rather than sink. This property makes butane a suitable fuel for lighters and portable stoves, as it easily evaporates and mixes with the surrounding air. **

The new lighter may not work as a windproof lighter after refilling because the refill process may have introduced air bubbles or impurities into the fuel chamber, affecting the lighter's ability to create a consistent and strong flame. Additionally, the refill process may not have been done properly, leading to an inadequate amount of fuel in the lighter. It's also possible that the lighter's design or construction is not suitable for maintaining a windproof flame after refilling. **

No, lighter fluid and butane gas are not the same. Lighter fluid is a liquid fuel typically made from petroleum distillates, while butane gas is a flammable gas that is commonly used as a fuel for lighters and camping stoves. They have different chemical compositions and physical states, with lighter fluid being a liquid and butane gas being a gas at room temperature. Therefore, they are not interchangeable and should not be used interchangeably. **

The main difference between a regular gas lighter and a butane gas lighter is the type of fuel they use. Regular gas lighters typically use a mixture of butane and propane, while butane gas lighters use only butane as their fuel source. Butane gas lighters are often considered to be more efficient and reliable, as butane burns cleaner and hotter than the mixture of butane and propane used in regular gas lighters. Additionally, butane gas lighters are often refillable, allowing for multiple uses, while regular gas lighters are often disposable. **

A windproof softshell jacket is a type of outerwear that is designed to provide protection from wind and light precipitation while also offering breathability and flexibility. It is typically made from a combination of materials such as polyester, nylon, and elastane, which allows for a comfortable and stretchy fit. The jacket is constructed with a windproof membrane or coating that helps to block out cold air and wind, making it ideal for outdoor activities in windy conditions. Additionally, it often features a water-repellent finish to provide some protection from light rain or snow. **

Iso-butane and butane have different boiling points because of their molecular structures. Iso-butane has a branched structure, which allows its molecules to pack more closely together, resulting in stronger intermolecular forces. This makes it more difficult to overcome these forces and reach the boiling point compared to butane, which has a linear structure with weaker intermolecular forces. As a result, iso-butane has a higher boiling point than butane. **