Because the glass has absorbed heat from the sun !
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A window feels warm on a sunny day because sunlight passes through the glass, which absorbs the energy and radiates it as heat. The heat is then trapped between the glass and the room, causing the window and surrounding area to warm up.
warm sunny day
On a warm sunny day, plants undergo photosynthesis at a faster rate, leading to an increase in oxygen (O2) production and a decrease in carbon dioxide (CO2) levels as they use it for photosynthesis. This can contribute to a higher amount of oxygen and lower amount of carbon dioxide in the atmosphere during the day.
To effectively heat a room using a solar-powered window heater, place the heater in a sunny window to absorb sunlight. The heater will convert the sunlight into heat, which will warm the room. Make sure the window is not blocked by any obstructions to allow maximum sunlight to enter. Adjust the angle of the heater to capture the most sunlight throughout the day.
Hooded jackets may be inappropriate for sunny days due to their warmth. The hood, especially, is valuable for keeping one's ears and neck warm on a cold day. Yet this may be unnecessary on a sunny day, as the sun itself provides warmth and a hood may block this.
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