In modern kitchen, mechanical kitchen scale, as an important measurement tool, is widely used in accurate measurement of ingredients. However, the environmental factors that are often ignored by air pressure actually have a significant impact on the accuracy of mechanical kitchen scale.

Basic concept of air pressure
Air pressure refers to the weight of the air on the unit area, usually measured by the units of millimeter Hg (MMHG) or Pascal (PA). The air pressure changes with the height of the altitude, usually about 1013.25 HPA (or 760 mmHg) on ​​the sea level. When the air pressure decreases, the density of the air will decrease, and this change directly affects the performance of the mechanical kitchen scale.

The effect of air pressure on the accuracy of mechanical kitchen scale
Change of air density
The working principle of mechanical kitchen scale depends on the balance of gravity and air buoyancy. When the air pressure is reduced, the density of the air is reduced, resulting in a decrease in buoyancy. This means that in a low -pressure environment, the weighing result of lightweight substances (such as flour, sugar, etc.) may be affected by greater buoyancy, causing the accuracy of the measurement result.
Error of weighing lightweight materials
In the low -pressure environment, the weight of lightweight materials may have significant deviations. For example, in high altitude areas, due to the decrease in air pressure, the weight of lightweight materials may be lighter than the actual weight. This phenomenon is particularly critical to baking and fine cooking, because these processes have stricter requirements for materials, and any tiny errors may affect the final cooking effect.

The impact of air pressure changes on the mechanical structure of the scale
The internal structure of the mechanical kitchen scale (such as spring, leverage, etc.) is usually designed based on the working principle under standard air pressure. Changes in air pressure may affect the working status of these mechanical components, resulting in inaccurate weight results. For example, the elasticity of spring may show different characteristics under different pressure conditions, which directly affects the response ability and measurement accuracy of the scale.

Actual cases of air pressure changes
Impact of high altitude areas
In high -altitude areas, the air pressure is significantly lower than the sea level, which will cause the mechanical kitchen scale to make an error when weighing lightweight ingredients. For example, in some mountainous areas, the air pressure may be lower than 800 HPA, which means that in this environment, the weight of the flour may be 5%to 10%lower than the actual weight. This deviation is particularly important for baking that requires precise formula, because it may directly affect the taste and structure of the finished product.
Weather changes
The air pressure also fluctuates with the weather. The low pressure system is usually related to rainy weather, while the high pressure system is related to the sunny weather. This weather change may lead to changes in air pressure in the kitchen environment, which affects the accuracy of mechanical kitchen scale. For example, if the air pressure drops during the cooking process, it may cause the original accurate weighing results to deviate, which will affect the stability of the entire cooking process.