For water at sea level (standard atmospheric pressure), the boiling point is 100 degrees Celsius (212 degrees Fahrenheit). When water is heated to this temperature, it transitions from a liquid to a gas, forming steam.
Daily Life Examples
| Substance | Boiling Point (Approx.) | Daily Life Examples |
|---|---|---|
| Water | 100°C (212°F) | Boiling water for cooking, making tea or coffee |
| Ethanol (Alcohol) | 78.37°C (173.07°F) | Evaporating alcohol during cooking, distillation processes |
| Milk | Varies, around 100°C (212°F) | Heating milk for hot beverages or cooking |
| Cooking Oil (e.g., Olive Oil) | Varies, around 160-240°C (320-464°F) | Deep-frying, sautéing, or other cooking methods |
| Acetone (Nail Polish Remover) | 56.5°C (133.7°F) | Evaporation when using nail polish remover |
| Vinegar | Varies, around 100°C (212°F) | Boiling vinegar for pickling or cooking purposes |
| Mercury | 356.7°C (673.9°F) | Historical use in thermometers, not common in daily life |
| Propane (LPG) | -42°C (-44°F) | Vaporization for heating, cooking, or as fuel in gas stoves |
Note: Boiling points can vary with altitude and pressure changes, and the values provided are approximate based on standard atmospheric pressure.
Factors Effecting Boiling Point
- Pressure: At higher elevations where the atmospheric pressure is lower, the boiling point of a substance is lower. Conversely, at lower elevations with higher atmospheric pressure, the boiling point is higher.
- Intermolecular forces: Substances with stronger intermolecular forces generally have higher boiling points. For example, water has relatively strong hydrogen bonding, contributing to its higher boiling point.
- Molecular mass: Larger molecules often have stronger attractive forces that require more energy to overcome.
- Presence of impurities: adding a solute to a solvent raises the boiling point of the solution compared to the pure solvent.
- Nature of the substance: Polar substances tend to have higher boiling points than nonpolar substances.
- Atmospheric conditions: In humid conditions, the effective pressure exerted by the surrounding air is reduced, leading to a lower boiling point.
- Surface tension: Surface tension can affect boiling points, especially for small quantities of a substance. This is more noticeable in small droplets or in confined spaces.