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Oceanography Science Fair Project

Temperature's Effect on Seawater

Temperature's Effect on Seawater | Science Fair Projects | STEM Projects
We'll investigate how temperature affects the pH and salinity of seawater. We'll measure the water height, pH level, and specific gravity of the seawater in 10 beakers at different temperatures.


The hypothesis is that increasing temperature causes the pH and salinity of seawater to increase.

Method & Materials

You will fill 10 beakers with seawater, measure the viscosity and pH levels, place a thermometer in each beaker, and place each beaker on a hot plate. You will regulate the hot plate so that the seawater in each beaker will reach a temperature of 20 °C, 25 °C, 30 °C, 35 °C, 40 °C, 45 °C, 50 °C, 55 °C, 60 °C and 65 °C respectively.
You will need 10 beakers of the same size, 1 pail of seawater, 1 ruler, 10 hotplates, 10 thermometers, pH paper, and a hygrometer.


After 24 hours, the results showed that the level of water fell as the temperature of the seawater increased, indicating a higher rate of evaporation. The increasing temperature also increased the specific gravity and the pH of the seawater.

Why do this project?

By testing the effects of increasing temperatures on seawater, this experiment reveals a worrisome impact of global warming on ocean health.

Also Consider

Experiment variations include placing a fan in front of a basin containing the seawater, and repeating the experiment using containers with different surface areas, like pails or large trays.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related videos

Hey there! Here are some awesome videos about this science project that we think you'll really like. They're not only super fun, but they'll also help you learn more about the science behind the project. So sit back, relax, and get ready to have some fun!!
As a marine biologist in the Maldives explains, rising ocean temperatures have far-reaching consequences for our precious marine ecosystems. This includes the devastating effects on coral reefs, changes in wave patterns, increased erosion, and the survival of various ocean species. It's a heartbreaking reality that we must take action to address before it's too late.
National Geographic's video brings attention to the global coral crisis, revealing the heart-wrenching reality of the devastating effects caused by rising ocean temperatures - just one of the many far-reaching impacts of climate change. This serves as a critical reminder of the urgent need to protect our planet's delicate ecosystems.
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