Strengthening Accuracy in Weather Observations

Mr Gonzo demonstrating how to remove bubbles from a minimum thermometer

Today, we had the privilege of conducting a hands-on training session at the Meteorological Services Department (MSD), focusing on how to remove bubbles from minimum alcohol-based thermometers — a critical step in ensuring precise temperature readings.

Our Lead Instrumentation Technician, Mr. Gonzo, led the demonstration, which was attended by MSD Meteorological Technicians. The session was highly impactful, equipping participants with practical skills that improve the quality of meteorological data.

Meteorological Services Department Technicians attending a demonstration session by FreedPer Scientific

But what causes these bubbles?

🔍 Common Causes Include:

• Temperature fluctuations leading to alcohol expansion and contraction

• Rough handling or shaking during transportation, which breaks the alcohol column

• Evaporation and re-condensation of alcohol

• Improper storage or minor manufacturing defects

These bubbles disrupt the liquid column, making the thermometer inaccurate and preventing the index bead from recording minimum temperatures properly.

✅ The Solution?

Mr. Gonzo demonstrated a simple yet effective method:

1. Gently heat the thermometer in lukewarm water to expand the alcohol and move the bubbles upward.

2. Allow it to cool slowly, which pulls the column back together — bubble-free.

   
   

This process ensures the accuracy and reliability of readings used in weather forecasting, agriculture, and climate-related decisions. MSD staff appreciated the training and engaged in a lively Q&A to explore maintenance best practices.

🔧 At FreedPer Scientific, we’re committed to building local capacity and supporting our national weather observation systems.