According to the Handbook of tropical residual soils(Huat et al, 2012), it's a 100mm diameter sample up to 450 mm long, obtained with the British U100, which is an open-driver sampler that produces samples with much higher quality than the SPT.
If the soil sample has 30 million particles of soil and 60 of those particles are sand, then the number of soil particles that are sand is 60. Sand particles represent 0.000002% of the total particles in the soil sample.
The soil sample with smaller particles tends to hold water better than the soil sample with larger particles. This is because smaller particles have higher surface area and can retain more water due to capillary action. Therefore, the soil sample with larger particles would likely lose water more quickly.
A soil sample contains living and nonliving materials. Which material was once living?
No, a typical soil sample is not an example of a homogeneous mixture. Soil is composed of various components such as minerals, organic matter, water, and air that are not uniformly distributed throughout the sample, making it a heterogeneous mixture.
A disturbed sample is one in which the structure of the soil has been changed sufficiently that tests of structural properties of the soil will not be representative of in-situ conditions, and only properties of the soil grains (e.g., grain size distribution, Atterberg limits, and possibly the water content) can be accurately determined. An undisturbed sample is one where the condition of the soil in the sample is close enough to the conditions of the soil in-situ to allow tests of structural properties of the soil to be used to approximate the properties of the soil in-situ.
You can watch videos online for the u100 at UCWeb. You can also find a collection of videos for the u100 at video forums such as YouTube and Metacafe by using their search function.
Samsung U100
No, a typical soil sample is heterogeneous.
In order to test for classification, moisture, density, and reactivity, soil samples are usually sent to a certified geotechnical laboratory. To provide precise results for engineering and construction needs, these labs employ specialised equipment.
If the soil sample has 30 million particles of soil and 60 of those particles are sand, then the number of soil particles that are sand is 60. Sand particles represent 0.000002% of the total particles in the soil sample.
Porosity is measured by taking a sample of the soil. The sample is then tested to measure the speed of water passing through the soil.
Very high speed is the best speed to separate a soil sample in a centrifuge.
To neutralise a sample of soil, you must determine the pH of the soil sample either acidic or alkaline. Add lime (e.g. Limestone) to acidic soil to neutralise it. And add sulphur to alkaline soil which will neutralise it.
Iron is magnetic so move a magnet through your soil sample to remove all the iron fillings.
The soil sample with smaller particles tends to hold water better than the soil sample with larger particles. This is because smaller particles have higher surface area and can retain more water due to capillary action. Therefore, the soil sample with larger particles would likely lose water more quickly.
Dirt
A soil sample contains living and nonliving materials. Which material was once living?