Why are dry measuring cups to measure both liquid and dry ingredients might cause a cake to fall?

Using dry measuring cups for liquid ingredients can lead to inaccuracies in measurements due to differences in density and volume. Liquid measuring cups are designed to account for the surface tension and meniscus of liquids, ensuring precise measurement. If a recipe calls for a specific volume of liquid and a dry cup is used, it may result in adding too much or too little liquid, which can affect the cake's structure and lead to it falling. Accurate measurements are crucial for the chemical reactions needed in baking to achieve the desired texture and rise.