What is the temperature of the water in the boiling tube when the timer shows 30 s?

To determine the temperature of the water in the boiling tube when the timer shows 30 seconds, several factors need to be considered. The boiling point of water occurs at 100 degrees Celsius (at 1 atm pressure), and the rate of heating, heat source, ambient conditions, and properties of the boiling tube also play a role.

1. Setup and Context: We first need to know how the water is being heated (e.g., a Bunsen burner, hot plate) and whether there's any insulation. This information is key for understanding how quickly the water is expected to reach boiling point.

2. Duration and Heating Rate: If we assume the water started at room temperature (approximately 20°C) and is being heated consistently, we can estimate the temperature rise after 30 seconds based on the rate at which heat is being applied.

3. Typical Scenarios: If the heat source is effective, the temperature at 30 seconds would likely be somewhere between room temperature and boiling point. For instance, with a consistent heat supply, it could range around 60-80°C depending on the starting volume of water and the power of the heat source.

Without specific data, a definitive temperature cannot be provided, but knowing these factors helps sketch a reasonable expectation of the water's temperature.

Summary

The estimated temperature of water in the boiling tube after 30 seconds would likely be within the range of 60°C to 80°C, depending on the heat source and starting conditions.