Environmental Exposure and Wood Decay

Medium

What happens to wood strength after two weeks in harsh conditions? You soak identical oak planks in four environments: - Rainwater - Acid water (simulating acid rain) - Salt water (simulating seawater) - Wet soil A fifth group stays dry as a control. After two weeks, you clamp each plank and hang weights until it breaks. Comparing the breaking points shows which environment weakens wood the most.

Hypothesis

The hypothesis is that the wood samples that were immersed in soil will start to decay and become weaker at a faster rate.

Science Concepts Learned

Material Durability

How much does the environment matter to wood's strength? This project answers that by soaking wood planks in rain water, acid rain, sea water, and wet soil for two weeks. You then clamp each plank and hang weights until it breaks. Comparing the breaking points reveals which environment weakens wood the most.

Wood Properties

Moisture changes how strong wood stays — one of its core properties. This project soaks identical oak planks in four environments: rainwater, acid water (simulating acid rain), salt water (simulating seawater), and wet soil. A fifth group stays dry as a control. After two weeks, each plank is clamped and weights are hung until it breaks. Comparing the breaking points shows which conditions weaken wood the most.

Method & Materials

You will inspect the dimensions of the wooden planks and divide them into five groups. You will then fill four pails with rain water, acid rain, sea water, and wet soil, and place the planks in the respective pails. The fifth group of planks will be left in a dry place. After two weeks, you will take the planks out of the pails and leave them to dry for three days. Finally, you will measure the strength of the wooden planks by applying weights to them.

You will need 20 oak wood planks, 16 bricks, 20 weights, tap water, a pail of rain water, a bottle of vinegar, 1000 grams of salt, four pails, soil, a rope, pH paper, and a black marker pen.

Eureka Crate — engineering & invention kits for ages 12+ — monthly projects that build real-world skills. (Affiliate link)

See what’s included

Results

After two weeks, it was observed that the wooden planks that were kept in the moist soil were the weakest among the five groups. The hypothesis that the wood immersed in the soil will start to decay and become weaker at a faster rate was proven to be true.

Why do this project?

This science project is interesting and unique because it explores the effects of different environmental factors on the strength of wood, which is an important factor in the construction of houses.

Also Consider

Consider repeating the experiment, this time exposing the wood for different lengths of time (1 week, 2 weeks etc) in order to study the rate at which the wood will weaken. Also, try using other types of wood like Pine, Fir, Hemlock or Birch.