# A.2.2: 有关荷载的附加信息

Karamba3D预期所有力定义都以（$$kN$$千克牛顿）为单位。在地球上，100千克的质量相当于大约$$1 kN$$的重力。确切的数字大约为$$0.981 kN$$，不过，$$1 kN$$通常已足够准确。表格[A.2.3.1](/chinese_1_3_3/appendix/a.4-background-information/a.4.3-tips-for-designing-statically-feasible-structures.md#table-a-2-3-1-specific-weights-of-some-building-materials)列出了部分日常材料的比重。关于荷载的经验法则，请详见表格[A.2.3.2](/chinese_1_3_3/appendix/a.4-background-information/a.4.3-tips-for-designing-statically-feasible-structures.md#table-a-2-3-2-loads-for-typical-scenarios)。不过请不要仅从字面上去理解这些值。例如，雪荷载依据地理情况的变化会有很大的差异。沿线或作用在指定区域上的荷载可以被看作与点荷载近似。用户需要做的就是估算每个节点的影响区域或其影响长度，并用其乘以给定的荷载值。**"Mesh-Load-component（网格荷载）"**运算器（请参阅第[3.2.1](/chinese_1_3_3/3-in-depth-component-reference/3.2-load/3.2.1-loads.md#mesh-load-const-and-variable)节）可以自动执行此任务，以进行表面荷载运算。


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://manual-1-3.karamba3d.com/chinese_1_3_3/appendix/a.4-background-information/a.4.2-additional-information-on-loads.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.