Herbs are plants with green, tender stems that are non-woody. They are commonly used in cooking, medicine, and aromatherapy, and often include varieties like basil, parsley, and mint.

Lemon plants are shrubs due to their bushy, multi-stemmed growth and small to medium size.

Unlike trees, they don't grow tall and have woody stems, fitting the shrub category of plants.

Mango is classified as a tree due to its large size, woody stem, and ability to grow up to 30-40 meters tall, making it distinct from shrubs and herbs.

Tomato plants are classified as herbs because they have soft, non-woody stems and are relatively short-lived, making them different from shrubs and trees.

Iron expands when heated because the increase in temperature causes its atoms to vibrate more, increasing the space between them, leading to thermal expansion typical of metals.

Condensation is the process of converting vapor into liquid form, typically when gas cools down and loses energy, allowing molecules to come closer together to form a liquid.