Interpretation of measurement terminology in high and low temperature damp heat test chamber
September 20 07:34:28, 2025
In the field of environmental testing, a variety of technical terms are commonly used. For non-experts, these terms may seem complex and scientific. To help better understand them, we have compiled explanations related to several key testing chambers, including high and low temperature damp heat test chambers, low-pressure test chambers, rain test chambers, dust test chambers, and mold test chambers.
1. **Temperature: Celsius (°C)**
Celsius is one of the most widely used temperature scales globally, represented by the symbol “°C.†It was introduced by the Swedish astronomer Anders Celsius in the 18th century. The formula for conversion from Fahrenheit is: °C = (°F – 32) ÷ 1.8. At standard atmospheric pressure, water freezes at 0°C and boils at 100°C. This scale is now part of the International System of Units (SI).
2. **Relative Humidity: Percentage (%)**
Relative humidity refers to the ratio of the current amount of water vapor in the air to the maximum amount it can hold at a given temperature. It is often expressed as RH (Relative Humidity). It can be calculated as the ratio of actual water vapor density to the saturated vapor density at the same temperature or as the ratio of the partial pressure of water vapor to the saturation pressure of water at that temperature.
3. **Precipitation: Millimeters (mm)**
Precipitation measures the depth of rainfall or snowfall that reaches the ground without evaporating, infiltrating, or being lost. Rainfall levels are categorized based on the amount over 24 hours: light rain (≤10 mm), moderate rain (10–24.9 mm), heavy rain (25–49.9 mm), storm (50–99.9 mm), and heavy storm (≥100 mm). Snowfall is also classified into categories like light snow (≥0.1 mm, <0.25 mm), medium snow (≥0.25 mm, <3 mm), and blizzard (≥5 mm).
4. **Atmospheric Pressure: Hectopascals (hPa)**
At sea level, the average atmospheric pressure is defined as 1 standard atmosphere, equal to 760 mmHg or approximately 101,325 pascals (101.325 kPa). Atmospheric pressure results from the weight of the air above a surface, and it decreases with altitude. It plays a critical role in many environmental tests, especially those involving low-pressure conditions.
5. **Wind: Beaufort Scale**
Wind is typically described using the Beaufort Scale, which categorizes wind speed into 13 levels, from 0 (calm) to 12 (hurricane). Wind speed is the rate at which air moves, measured in meters per second (m/s), while wind level refers to the intensity of the wind. Higher wind speeds correspond to higher wind levels and greater potential for damage. In China, the scale has been extended up to 17 for extreme weather events.
Understanding these technical terms helps improve comprehension of environmental testing procedures and ensures accurate execution of tests. Whether you're working in product development, quality control, or research, having a clear grasp of these measurements is essential for success.