During an investigation of heat transfer, students poured 200g of 70 degrees celcious water in the sample A container and 200g 5 degrees celsious water into sample B container. The containers were then sealed with a foam lid and U Shaped aluminum bar was inserted into each liquid to monitor the temperature. The graph below shows the data collected by the students on change in temperature of the two liquids over 4 hours.
Temp A: 70*C
Temp B: 5*C
If the students continue to gather temperature data for more hours, which of the following should the to gather temperature data for more hours which of the following should the students expect to observe and why?
Based on the information given, the students should expect to observe the following:
1. The temperature of sample A to gradually decrease over time.
This is because sample A initially had a higher temperature (70°C) compared to sample B (5°C), indicating that sample A had more thermal energy to lose. As heat is transferred from the liquid to the surrounding environment, the temperature will decrease until it reaches equilibrium with the surroundings.
2. The temperature of sample B to gradually increase over time.
Similarly, sample B initially had a lower temperature (5°C) compared to sample A (70°C), indicating that sample B had less thermal energy. As heat is transferred from sample A to sample B, the temperature of sample B will increase until it reaches equilibrium with sample A.
3. Eventually, the temperatures of both samples will reach a stable point.
As heat continues to transfer between the two samples, they will continue to approach each other until they reach thermal equilibrium. At this point, the temperatures of both samples will stabilize and remain constant, assuming no further external heat sources or energy losses.
Overall, the students should expect to observe a gradual decrease in the temperature of sample A and a gradual increase in the temperature of sample B until both reach stable temperatures.
is this conduction or convection?
The process described here is primarily conduction. Conduction refers to the transfer of heat energy through direct contact between materials. In this scenario, the U-shaped aluminum bars inserted into each liquid provide a direct pathway for heat to transfer from one sample to the other. The heat energy flows from the higher temperature sample (A) to the lower temperature sample (B) through the metal bars.
Based on the given information, the students poured 200g of 70 degrees Celsius water into sample A container and 200g of 5 degrees Celsius water into the sample B container. They then sealed the containers with a foam lid and inserted a U-shaped aluminum bar into each liquid to monitor the temperature. The graph shows the data collected over a 4-hour period.
Since sample A starts at a higher temperature of 70 degrees Celsius compared to sample B which starts at 5 degrees Celsius, we can expect heat to transfer from sample A to sample B. This transfer of heat will result in the temperatures of the two samples becoming closer to each other over time.
If the students continue to gather temperature data for more hours, they should expect to observe that the temperatures of sample A and sample B will gradually approach each other. In other words, the temperature of sample A will decrease while the temperature of sample B will increase.
This can be explained by the principle of thermal equilibrium, which states that when two objects at different temperatures are in contact with each other, heat will transfer from the object at a higher temperature to the object at a lower temperature until they reach the same temperature.
Therefore, as the temperatures of sample A and sample B approach each other, the rate of temperature change will decrease, and eventually, they will reach a state of thermal equilibrium where their temperatures will be the same.