What is the definition of diffusion?

Question

BlackTom AI · Accepted Answer

Question restatement: What is the definition of diffusion?

Option 1: 'the average distance travelled by a particle between collisions.' This describes the mean free path or the concept used in kinetic theory to quantify how far a particle travels before colliding, not diffusion itself. It is a transport distance measure, not the spread of particles through space.

Option 2: 'the leakage of gas molecules from a container through a tiny hole' This is better described as effusion, which involves gas molecules escaping through an opening into a vacuum or lower pressure region, not diffusion through space within a medium.

Option 3: 'the spreading of gas molecules through space.' This matches the standard definition of diffusion: the gradual dispersion of particles from regions of higher concentration to regions of lower concentration, resulting in the spread of molecules through space.

Option 4: 'the average distance travelled by a molecule after hundreds of collisions.' This phrase evokes ideas related to diffusion length or random-walk behavior, but it does not define diffusion itself. It describes a consequence or characteristic of particle motion over many collisions, rather than the process of spreading through space.

In sum, the core concept of diffusion is the spreading or mixing of particles through space from regions of higher concentration to lower concentration, which corresponds to Option 3. The other options refer to related transport ideas (mean free path, effusion, diffusion length) but do not define diffusion itself.

What is the definition of diffusion?单项选择题

类似问题

Add a drop of dye to the edge of the system by clicking in a corner of the simulator space. How does the red dye eventually diffuse throughout the simulation space?

Reset ↻ the simulator after you’ve had a play around, set temperature to low, and press ► play How would you describe the movement of the water molecules in this simulation? Clicking Trace random molecule might help.

Report the skewness statistic of the journey elapsed time amongst respondents who do not live in regional areas. Report your answer to 2 decimal places.

Report the standard deviation of the journey elapsed time amongst respondents who live in regional areas. Report your answer to one decimal place.

What is the probability that a randomly selected student travelling on Thursday has a travel time greater than 50 minutes? Provide your answer in decimal, and report it to 4 decimal places. Do not report as a percentage.

What is the probability that a randomly selected student travelling on Wednesday has a travel time greater than 50 minutes? Provide your answer in decimal and report it to 4 decimal places. Do not answer as a percentage.

What type of probability did you report in Q2?

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单