Am asking the question
The lumen is the space within the blood vessel (or within any tubular structure).
The hollow core of a needle is called the lumen. It is the open space inside the needle through which fluids are drawn or injected.
Hollow core doors have a hollow space inside, making them lighter and more affordable, but less soundproof and insulating. Solid core doors are heavier and more expensive, but offer better soundproofing and insulation.
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Solid core doors are more durable and provide better sound insulation compared to hollow core doors. Solid core doors are made of solid material throughout, making them heavier and more resistant to damage. They also offer better soundproofing qualities due to their dense construction. On the other hand, hollow core doors have a hollow interior, making them lighter and less durable. They also provide less sound insulation compared to solid core doors.
Human hair is not hollow. It is solid right through and made up of different layers. The core is called the medulla. The outermost layer is called the dermic coat.
Vessel Fitness - 2006 Core Abs 1-2 was released on: USA: 10 January 2006
Vessel Fitness - 2006 Core Fusion 2-2 was released on: USA: 10 March 2009
core, bore, hole,
Choosing a hollow core wood door for your home can offer advantages such as being lightweight, cost-effective, and providing good sound insulation.
Solid core doors are made of solid material throughout, providing better soundproofing and durability. Hollow core doors have a honeycomb-like structure inside, making them lighter and more affordable but less soundproof. Solid core doors are more suitable for homes where soundproofing and durability are important, while hollow core doors are a good choice for areas where weight and cost are primary concerns.
Scientific evidence, such as seismic waves and gravity measurements, indicate that the Earth has a solid core surrounded by various layers of molten and solid rock. These studies show that the Earth's interior is not hollow but rather composed of different materials at varying depths.