<p>I have the <em>Soil Size Distribution Diagram</em> shown below from a source that does not specify the meaning of the labels A1=60, A2=50, and A3=50. I understand that it is data for three different samples, but what do the numbers (60, 50, 50) indicates?</p>
<p><a href="https://i.sstatic.net/Yp5GH.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/Yp5GH.jpg" alt="enter image description here" /></a></p>
<p>The diagram is constructed following a standard protocol where soil is collected, washed, dried, and sieved.</p>
<p>If anyone can shed some light on the meaning of the labels A1=60, A2=50, and A3=50, it would be most helpful.</p>

CC BY-SA 4.0
2023-09-12T01:46:53.230Z
Perhaps you should give the source, people may have more info from that
JeopardyTempest
CC BY-SA 4.0
2023-09-12T08:18:33.417Z
It is from an ISO standard 13.060.30 (sewage water disposal and treatment https://www.iso.org/ics/13.060.30/x/). Not many details are included in the text; my guess is that it is some standard way of labeling curves that I'm not familiar with.
John
<soil>
Reading a Soil Size Distribution Diagram
John
# Reading a Soil Size Distribution Diagram

(Asked by: username_0 on 2023-09-11)

I have the *Soil Size Distribution Diagram* shown below from a source that does not specify the meaning of the labels A1=60, A2=50, and A3=50. I understand that it is data for three different samples, but what do the numbers (60, 50, 50) indicates?

[![enter image description here](https://i.sstatic.net/Yp5GH.jpg)](https://i.sstatic.net/Yp5GH.jpg)

The diagram is constructed following a standard protocol where soil is collected, washed, dried, and sieved.

If anyone can shed some light on the meaning of the labels A1=60, A2=50, and A3=50, it would be most helpful.

**Tags:** soil

> **Comments:**
> **username_1**: Perhaps you should give the source, people may have more info from that  
> **username_0**: It is from an ISO standard 13.060.30 (sewage water disposal and treatment https://www.iso.org/ics/13.060.30/x/). Not many details are included in the text; my guess is that it is some standard way of labeling curves that I'm not familiar with.  

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## 0 answers

